WO2024103216A1

WO2024103216A1 - Method for displaying an image on an electronic paper display and related devices

Info

Publication number: WO2024103216A1
Application number: PCT/CN2022/131706
Authority: WO
Inventors: Kenichi Takatori; Yasuyuki Teranishi; Teppei Isobe
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2024-05-23

Abstract

Embodiments of the present application provide a method for displaying an image on an electronic paper display and related devices. The method includes: determining that the electronic paper display is to display a first image; determining whether a first pixel value is the same as a second pixel value; when the first pixel value is different from the second pixel value, repeatedly generating a first voltage signal until a pixel value to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time is equal to a maximum repetition time. According to the above-mentioned technical solution, electronic paper units of the electronic paper display can be applied to the same signals several times for improving a contrast ratio. Meanwhile, since a repetition time of a voltage signal is determined according to both the maximum repetition time and a change of a color displayed by an electronic paper unit, repeated voltage signals do not hurt a pattern of an input image.

Description

METHOD FOR DISPLAYING AN IMAGE ON AN ELECTRONIC PAPER DISPLAY AND RELATED DEVICES

TECHNICAL FIELD

Embodiments of the present application relate to the field of displaying technologies, and more specifically, to a method for displaying an image on an electronic paper display and related devices.

BACKGROUND

Electronic paper is a display technology that mimics appearance of ordinary ink on paper. An electronic paper display (EPD) , sometimes also an electrophoretic display, is a reflective-type display with a memory effect. It needs no power in keeping a memorized image. Unlike backlit flat panel displays (e.g., liquid crystal display (LCD) and organic light-emitting diode (OLED) ) that emit light, the EPD reflects light like paper. This may make it more comfortable to read and provide a wider viewing angle than most light-emitting displays. However, response of the current EPD material is very slow compared to the backlit flat panel displays. Therefore, the EPD is often used in some terminals whose refresh rate is rather slow and needs a good static image, such as e-book readers, price tags, e-paper magazines, and so forth.

SUMMARY

Embodiments of the present application provide a method for displaying an image on an electronic paper display and related devices. The technical solution may improve a contrast ratio of the image displayed by the electronic paper display.

According to a first aspect, an embodiment of the present application provides a method for displaying an image on an electronic paper display, wherein including: determining that the electronic paper display is to display a first image; determining whether a first pixel value is the same as a second pixel value, where the first pixel value is a value of a first pixel in the first image, the second pixel value is a value of a second pixel in a second image, the second image is an image displayed by the electronic paper display before displaying the first image, the second pixel is displayed by a first electronic paper unit of the electronic paper display; when the first pixel value is different from the second pixel value, repeatedly generating a first voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time equals a maximum repetition time, where the first voltage signal is configured to drive the first electronic paper unit to display the first pixel, and where the first repetition time is the number of repetitions to generate the first voltage signal.

According to the above-mentioned technical solution, electronic paper units of the electronic paper display can be applied to the same signals several times for improving the contrast ratio. Meanwhile, since a repetition time of the voltage signal is determined according to both the maximum repetition time and a change of a color displayed by an electronic paper unit, the repeated voltage signals do not hurt a pattern of an input image.

In a possible design, the method further includes: when the first pixel value is the same as the second pixel value, determining whether a second repetition time is less than the maximum repetition time, where the second repetition time is the number of repetitions to generate a second voltage signal, and where the second voltage signal is configured to drive the first electronic paper unit to display the second pixel; when the second repetition time is less than the maximum repetition time, repeatedly generating the second voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the second pixel value or the second repetition time is equal to the maximum repetition time.

In a possible design, before the repeatedly generating a first voltage signal, the method further includes: determining a working mode of the electronic paper display, where the working mode of the electronic paper display includes a first working mode or a second working mode, and where a refresh rate of the first working mode is higher than a refresh rate of the second working mode; when the working mode of the electronic paper display is the first working mode, determining that the maximum repetition time is a first maximum repetition time; when the working mode of the electronic paper display is the second working mode, determining that the maximum repetition time is a second maximum repetition time, where the first maximum repetition time is larger than the second maximum repetition time.

According to the above-mentioned technical solution, the electronic device may work in two different working modes, and each working mode has a corresponding maximum repetition time. Therefore, the electronic device may determine the working mode according to the refresh rate corresponding to the image. For example, if the image is a frame of a video, the electronic device may work in the first working mode; if the image is a picture, the electronic device may work in the second working mode.

In a possible design, before the repeatedly generating a first voltage signal, the method further includes: determining that a working mode of the electronic paper display is a first working mode; determining that the maximum repetition time is the first maximum repetition time. After repeatedly generating the first voltage, the method further includes: determining that the electronic paper display is to display a third image; determining that the second pixel value is different from a third pixel value, where the third pixel value is a value of a third pixel in the third image; determining the working mode of the electronic paper display is a second working mode, where a refresh rate of the first working mode is higher than a refresh rate of the second working mode; repeatedly generating a third voltage signal until a third repetition time equals a second maximum repetition time, where the third voltage signal is configured to drive the first electronic paper unit to display the third pixel, where the third repetition time is the number of repetitions to generate the third voltage signal.

Optionally, the first maximum repetition time is larger than the second maximum repetition time.

According to the above technical solution, the electronic device may work in the two different working modes, and each working mode has the corresponding maximum repetition time. In addition, an actual repetition time of the first working mode is less than or equal to the first maximum repetition time, but an actual repetition time of the second working mode is equal to the second maximum repetition time. In another word, when the electronic device works in the first working mode, the repetition time of the voltage signal is adaptive according to the maximum repetition time and variation of the displayed image; when the electronic device works in the second working mode, the repetition time of the voltage signal is fixed. The second working mode is appropriate for a low refresh rate, and the first working mode is appropriate for a high refresh rate. Therefore, the electronic device may determine the working mode according to the refresh rate corresponding to the image. For example, if the image is the frame of the video, the electronic device may work in the first working mode; if the image is the picture, the electronic device may work in the second working mode.

In a possible design, when the first repetition time N ₁ is greater than one and the value of the pixel to be displayed by the first electronic paper unit is different from the first pixel value, a last one of N ₁ first voltage signals includes a set of opposite pulses.

The set of opposite pulses enables a faster response when changing a sign, and prevent images from sticking to previous images.

In a possible design, the set of opposite pulses includes a positive pulse and a negative pulse. When a color of the first pixel is black and a color of the pixel to be displayed by the first electronic paper unit is white, the positive pulse precedes the negative pulse; when the color of the first pixel is white and the color of the pixel to be displayed by the first electronic paper unit is black, the negative pulse precedes the positive pulse.

According to a second aspect, an embodiment of the present application provides an electronic device, and the electronic device has a function of implementing the method in the first aspect. The function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware of the software includes one or more modules corresponding to the function.

According to a third aspect, an embodiment of the present application provides a computer readable storage medium, including an instruction. When the instruction runs on an electronic device, the electronic device is configured to perform the method in the first aspect or any possible implementation of the first aspect.

According to a fourth aspect, an electronic device is provided, including a processor and a memory. The processor is connected to the memory. The memory is configured to store an instruction, and the processor is configured to execute the instruction. When the processor executes the instruction stored in the memory, the processor is configured to perform the method in the first aspect or any possible implementation of the first aspect.

According to a fifth aspect, a chip system is provided, where the chip system includes a memory and a processor, where the memory is configured to store a computer program, and the processor is configured to invoke the computer program from the memory and run the computer program, so that an electronic device on which the chip system is disposed performs the method in the first aspect or any possible implementation of the first aspect.

According to a sixth aspect, a computer program product is provided, where when the computer program product runs on an electronic device, the electronic device is configured to perform the method in the first aspect or any possible implementation of the first aspect.

According to a seventh aspect, an electronic paper display is provided, where the electronic paper display includes the electronic device in the second aspect or the fourth aspect.

According to an eighth aspect, a terminal device is provided, where the terminal device includes the electronic paper display in the seventh aspect.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a structure of a terminal device with an electronic paper display.

FIG. 2 is a schematic diagram of a structure of an electronic paper display.

FIG. 3 is a diagram of a structure of an electronic paper unit.

FIG. 4 shows an input image pattern of an electronic paper unit in 15 frames.

FIG. 5 illustrates a diagram of an embodiment method for displaying an image on an electronic paper display.

FIG. 6 shows an input image pattern of an electronic paper unit and a display pattern of the electronic paper unit with adaptive multiple writing.

FIG. 7 shows a waveform corresponding to a display pattern of an electronic paper unit with adaptive multiple writing.

FIG. 8 shows a display pattern of an electronic paper unit with adaptive multiple writing and a corresponding waveform.

FIG. 9 shows a waveform including pre-activation.

FIG. 10 is a schematic block diagram of an electronic device according to an embodiment of the present application.

DESCRIPTION OF EMBODIMENTS

The following describes the technical solutions in the present application with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a structure of a terminal device with an electronic paper display. Referring to FIG. 1, a terminal device 100 may include a processor 110, a memory 120, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an electronic paper display 150, and the like.

It can be understood that, a structure illustrated in the embodiment of the present application does not constitute a specific limitation to the terminal device 100. In some other embodiments of the present application, the terminal device 100 may include more or fewer components than those shown in the figure, or combine some components, or split some components, or have different component arrangements. The components shown in the figure may be implemented by hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units. For example, the processor 110 may include a central processing unit (CPU) , an application processor (AP) , a modem processor, a graphics processing unit (GPU) , an image signal processor (ISP) , a controller, a video codec, a digital signal processor (DSP) , and/or the like. Different processing units may be independent components, or may be integrated into one or more processors.

A memory may be further disposed on the processor 110, and is configured to store instructions and data. In an embodiment, the memory in the processor 110 is a cache memory. The memory may store instructions or data just used or cyclically used by the processor 110. If the processor 110 needs to use the instructions or the data again, the processor may directly invoke the instructions or the data from the memory. This avoids repeated access, reduces waiting time of the processor 110, and improves system efficiency.

The processor 110 may communicate with the electronic paper display 150 through an interface to implement a display function of the terminal device 100. The interface may be a serial peripheral interface (SPI) , a mobile industry processor interface (MIPI) , a general-purpose input/output (GPIO) interface, and/or the like.

It can be understood that, an interface connection relationship between modules illustrated in the embodiment of the present application is merely an example for description, and does not constitute the limitation to a structure of the terminal device 100. In some other embodiments of the present application, the terminal device 100 may alternatively use an interface connection mode different from that in the foregoing embodiment, or use a combination of a plurality of interface connection modes.

The charging management module 140 is configured to receive a charging input from a charger. The charger may be a wireless charger or a wired charger. In an embodiment of wired charging, the charging management module 140 may receive the charging input from the wired charger through the USB interface 130. In an embodiment of wireless charging, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the terminal device 100. When charging the battery 142, the charging management module 140 may further supply power to the terminal device through the power management module 141.

The power management module 141 is configured to be connected to the battery 142, the charging management module 140, and the processor 110. The power management module 141 receives an input from the battery 142 and/or the charging management module 140, and supplies power to the processor 110, the memory 120, the display screen 150, and the like. The power management module 141 may be further configured to monitor parameters such as a battery capacity, a battery cycle count, and a battery health status (electric leakage or impedance) . In an embodiment, the power management module 141 may alternatively be disposed on the processor 110. In another embodiment, the power management module 141 and the charging management module 140 may alternatively be disposed on the same device.

The display screen 150 is configured to display an electronic book, an image, a video, or the like. The video codec is configured to compress or decompress a digital video. The terminal device 100 may support one or more types of video codecs. In this way, the terminal device 100 may play or record videos in a plurality of coding formats, for example, Moving Picture Experts Group (MPEG) 1, MPEG 2, MPEG 3, and MPEG 4.

The memory 120 may be configured to store computer-executable program code. The executable program code includes instructions. The memory 120 may include a program storage area and a data storage area. The program storage area may store an operating system, an application program required by at least one function (for example, a video playing function or an image playing function) , and the like. The data storage area may store data (for example, images, videos or an electronic book) created in a process of using the terminal device 100. In addition, the memory 120 may include a high-speed random access memory, or may include a nonvolatile memory, for example, at least one magnetic disk storage device, a flash memory, or a universal flash storage (UFS) . The processor 110 runs the instructions stored in the memory 120 and/or the instructions stored in the memory disposed on the processor, to perform various function applications of the terminal device 100 and data processing.

FIG. 2 is a schematic diagram of a structure of an electronic paper display. Referring to FIG. 2, the electronic paper display 200 includes a display panel 210 and a driving circuit 220.

An image displayed by the display panel 110 includes a plurality of pixels, and the pixels respectively correspond to a plurality of electronic paper units of the display panel 110. In some embodiments, the pixel may be in one-to-one correspondence with the electronic paper unit. In some other embodiments, one electronic paper unit may correspond to several pixels. In some other embodiments, one pixel may correspond to several electronic paper units. The driving circuit 220 is configured to provide voltage signals to the display panel 110 for driving the electronic paper particles in the electronic paper units. The display panel 110 can display an image according to the voltage signals.

In the present application, the term “pixel” is a physical point in an image displayed by the electronic paper display. For example, if a size of an image is 128 × 128, there are 128 × 128 pixels in the image. The electronic paper unit is the hardware that is used to display the corresponding pixel. Each electronic paper unit includes an electrode. The electrode corresponds to K microcapsule (s) , where K is a positive number. In another word, in some embodiments, one electrode may correspond to an integer number of microcapsules. For example, one electrode may correspond to one, two, three, or more microcapsules. In some other embodiments, one electrode may correspond to a non-integer number of microcapsules. For example, one electrode may correspond to 1/3, 1/2, 2/3, 1 ¹/ ₃, or 1 ³/ ₄ microcapsules.

FIG. 3 is a diagram of a structure of an electronic paper unit.

Referring to FIG. 3 (a) , each electronic paper unit (EPU) includes a bottom electrode and the electrode corresponds to three microcapsules. When a low voltage signal is applied to the electrode of an EPU 1, black particles in the corresponding microcapsules move to the bottom of the microcapsules, white particles move to the top of the microcapsules, and the microcapsules corresponding to the EPU 1 appear white; when a high voltage signal is applied to the electrode of an EPU 2, the white particles move to the bottom of the microcapsules, the black particles move to the top of the microcapsules, and the microcapsules corresponding to the EPU 2 appear black.

Referring to FIG. 3 (b) , each EPU includes a bottom electrode and the electrode corresponds to 1/2 microcapsule. When the low voltage signal is applied to the electrode of the EPU 1 and the electrode of the EPU 2, the black particles in the microcapsule corresponding to the EPU 1 and the EPU 2 move to the bottom of the microcapsules, the white particles move to the top of the microcapsule corresponding to the EPU 1 and the EPU 2, and the microcapsule corresponding to the EPU 1 and the EPU 2 appear white. When the low voltage signal is applied to the electrode of an EPU 3 and the high voltage signal is applied to the electrode of an EPU 4, the black particles in part of the microcapsule corresponding to the EPU 3 (that is, a left part of the microcapsule) move to the bottom of the microcapsules, the white particles in the part of the microcapsule corresponding to the EPU 3 move to the top of the microcapsules, and the part of the microcapsule corresponding to the EPU 3 appears white; the white particles in the part of the microcapsule corresponding to the EPU 4 (that is, a right part of the microcapsule) move to the bottom of the microcapsules, the black particles in the part of the microcapsule corresponding to the EPU 4 move to the top of the microcapsules, and the part of the microcapsule corresponding to the EPU 4 appears black.

One microcapsule includes electronic paper particles. When a voltage signal is applied to the electrode of the electronic paper unit, the electronic paper particles move to a corresponding direction, so the electronic paper unit displays the corresponding pixel.

In some embodiments, each microcapsule includes electronic paper particles of two colors. For example, the microcapsule may include white electronic paper particles and black electronic paper particles. The driving circuit 120 drives the electronic paper particles to move in the microcapsule by applying a voltage, so as to enable each electronic paper unit of the display panel 110 to display black, white, or grayscale respectively.

In some embodiments, each microcapsule includes black particles. The black particles disperse within the microcapsule, so the microcapsule shows black. When a charge is applied, the black particles move to a side to allow a transparent area of the microcapsule and the microcapsule shows white.

In some embodiments, each microcapsule includes negatively-charged white particles and not-charged black particles. When a positive or negative electric field is applied, the white particles move to one side corresponding to the applied electric field and black particles are moved to the other side, and a viewer will see white or black.

In some embodiments, each microcapsule includes negatively charged white particles and positively charged black particles. When a positive or negative electric field is applied, corresponding particles move to the top of the microcapsule where they become visible to the viewer, which makes the microcapsule appear white or black.

In some embodiments, each microcapsule includes negatively charged white particles, positive charged color particles (e.g., positive charged red particles or positive charged yellow particles) , and positive charged black particles. A charge is applied to the particles and electrode of the electronic paper unit including the microcapsule to facilitate movement. Different colors may be controlled by different charges. For example, one charge can control color particles to rise to the top and become visible, and the other charge can control the black particles to rise to the top and become visible.

An example in which the microcapsule in the electronic paper unit includes negatively charged white particles and positively charged black particles is used for a detailed description in the following. It should be appreciated that the embodiments of the present application can also be used for a microcapsule including only one pigment or more than two pigments.

Embodiments of the present application provide a method for displaying an image on an electronic paper display. According to the embodiments of the present application, the electronic paper display may keep writing the same voltage signals to an electronic paper unit until a maximum repetition time is reached, or the electronic paper display keeps writing the same voltage signals to the electronic paper unit until a color displayed by the electronic paper unit changes before the maximum repetition time is reached. For ease of description, the above-mentioned writing method can be referred to as adaptive multiple writing.

In comparison with the adaptive writing, there are two other writing methods, single writing and forced multiple writing. As the name implies, the single writing means that the voltage signal may be written only once after the color displayed on the electronic paper unit display has changed. The forced multiple writing means that the voltage signal may be written several times after the color displayed on the electronic paper unit display has changed, and the writing time is fixed. For example, if the fixed time is 6, when the color displayed by the electronic paper unit changes from black to white, a voltage signal that makes the electronic paper unit display white is written to the electronic paper unit 6 times. Both the single writing and the forced multiple writing have a flaw. According to a principle of the electronic paper unit, the voltage signal controls movement of the electronic paper particles in the electronic paper unit. For example, a high voltage signal (e.g., 15 Voltages (V) ) makes the black particles rise to the top and becomes visible, and a low voltage signal (e.g., -15V) makes the white particles rise to the top and become visible. However, one high/low voltage signal cannot make all of the black/white particles rise to the top. If the high voltage single is written to the electronic paper unit only once, not all of the black particles rise to the top and some white particles may remain at the top, so the electronic paper may show dark gray instead of black. Similarly, if the low voltage single is written to the electronic paper unit only once, not all of the white particles rise to the top and some black particles may remain at the top, so the electronic paper unit may show light gray instead of white. Therefore, the single writing may cause a low contrast ratio. The number of times the voltage signal is written is proportional to the number of moving particles. The more repetition times of the high voltage signal, the more black particles move to the top and the color displayed by the electronic paper unit is closer to black; the more repetition times of the low voltage signal, the more white particles move to the top and the color displayed by the electronic paper unit is closer to white. Therefore, the forced multiple writing may provide a better contrast ratio.

However, the forced multiple writing may cause an abnormal image display. FIG. 4 shows an input image pattern of an electronic paper unit and a display pattern of an electronic paper unit with the forced multiple writing.

FIG. 4 shows an input image pattern of an electronic paper unit in 15 frames, a frame F ₀ to a frame F ₁₄. It is assumed that a refresh rate is 24Hz, so duration of each frame is 41.7ms. The input image pattern of the electronic paper unit reflects a color of one pixel in images that should be displayed by the electronic paper unit. For convenience, it is assumed that consecutive frames with the same color in the input image pattern are from the same image. In another word, the input image pattern shown in FIG. 4 comes from 4 images. The first three frames are from the image 1, frames F ₃ and F ₄ are from the image 2, frames F ₅ to F ₈ are from the image 3, and frames F ₉ to F ₁₄ are from the image 4. A letter W and a letter B shown in the input image pattern mean the color of the pixel is white and black, respectively. For example, the letter W in frames F ₀ to F ₂ of the input image pattern means that the color of the pixel in the image 1 is white; the letter B in frames F ₅ to F ₈ of the input image pattern means that the color of the pixel in the image 4 is black.

FIG. 3 also shows a display pattern of an electronic paper unit with the forced multiple writing using different repetition times. The forced × 3 shown in FIG. 3 is a display pattern with the forced multiple writing and a repetition time is 3; the forced × 4 shown in FIG. 3 is a display pattern with the forced multiple writing and the repetition time is 4; the forced × 5 shown in FIG. 3 is a display pattern with the forced multiple writing and the repetition time is 5. The display pattern of the electronic paper unit reflects the voltage signal applied to the electronic paper unit. The letter W and the letter B shown in the display pattern mean that the voltage signals applied to the electronic paper unit are used to make the electronic paper unit display white and black. For example, the letter W in frames F ₀ to F ₂ of the display pattern of forced ×3 means that the voltage signal applies to the electronic paper unit is a voltage signal that makes the electronic paper unit display white; the letter B in frames F ₃ to F ₅ of the display pattern of the forced ×3 means that the voltage signal applies to the electronic paper unit is a voltage signal that makes the electronic paper unit display black. The number 0 shown in the display pattern with the forced multiple writing means that there is no voltage signal applied to the electronic paper unit. For ease of description, the voltage signal that makes the electronic paper unit display black is referred to as a black signal, and the voltage signal that makes the electronic paper display white is referred to as a white signal.

The voltage signal of the forced multiple writing is determined according to the color of the pixel in the image. For the case of the forced multiple writing with the repetition time of three, referring to the input image pattern, since the color of the first frame F ₀ is white, three white signals are generated and applied to the electronic paper unit; since the color of the fourth frame F ₃ is black, three black signals are generated and applied to the electronic paper unit; since the color of the seventh frame F ₆ is white, three white signals are generated and applied to the electronic paper unit; since the color of the tenth frame F ₉ is black, three black signals are generated and applied to the electronic paper unit; since the color of the thirteenth frame F ₁₂ is black and three black signals have been applied to the electronic paper unit, there is no need to generate and apply voltage signals to the electronic paper unit.

For the case of the forced multiple writing with the repetition time of four, since the color of the first frame F ₀ is white, four white signals are generated and applied to the electronic paper unit; since the color of the fifth frame F ₄ is black, four black signals are generated and applied to the electronic paper unit; since the color of the ninth frame F ₈ is white, four white signals are generated and applied to the electronic paper unit; since the color of the thirteen frame F ₁₂ is black, four black signals are generated and applied to the electronic paper unit (the last black signal does not show in FIG. 4) .

For the case of the forced multiple writing with the repetition time of five, since the color of the first frame F ₀ is white, five white signals are generated and applied to the electronic paper unit; since the color of the sixth frame F ₅ is white, five white signals are generated and applied to the electronic paper unit; since the color of the eleventh frame F ₁₀ is black, five black signals are generated and applied to the electronic paper unit.

Compared with the input image pattern, the display patterns are imprecise. In another word, the display patterns are not identical to the input image pattern.

For example, for the case of the forced multiple writing with the repetition time of three, the color of the pixel of the frame F ₅ in the input image pattern is white, but the voltage signal applied to the electronic paper unit is the black signal, so the color displayed by the electronic paper unit is black. Under this condition, the number of the frames used to display black in the image 2 is 3 instead of 2. In another word, for the electronic paper unit, the number of frames actually used to display black in the image 2 is greater than the number of frames of the image 2. Correspondingly, the number of frames actually used to display white in the image 3 is less than the number of frames of the image 3.

For another example, for the case of the forced multiple writing with the repetition time of five, the color of the pixel of the frames F ₃ and F ₄ in the input image pattern is black, but the voltage signal applied to the electronic paper unit is the white signal, so the color displayed by the electronic paper unit is white. Under this condition, the electronic paper unit does not display the color of the pixel in the image 2.

The adaptive multiple writing provided by the embodiments of the present application may provide a better contrast ration than the single writing and do not have the issue of the forced multiple writing.

FIG. 5 illustrates a diagram of an embodiment method for displaying an image on an electronic paper display. The method shown in FIG. 5 is the adaptive multiple writing. The method shown in FIG. 5 may be performed by a terminal device including the electronic paper display, the electronic paper display, a component of the terminal device (e.g., the processor of the terminal device) , and/or a component of the electronic paper display (e.g., the driving circuit of the electronic paper display) . For convenience, it is assumed that the method shown in FIG. 5 is performed by the electronic paper display.

501, The electronic paper display determines that the electronic paper display is to display a first image.

502, The electronic paper display determines whether a first pixel value is the same as a second pixel value.

The first pixel value is a value of a first pixel in the first image, the second pixel value is a value of a second pixel in a second image; the second image is an image displayed by the electronic paper display before displaying the first image, the second pixel is displayed by a first electronic paper unit of the electronic paper display.

A color of a pixel is determined according to a value of the pixel. For example, if an image is a binary image, there are only two possible values for each pixel and each pixel can only appear black or white. If an image is a greyscale image with 256 gray levels, there are 256 possible values for each pixel and each pixel can appear 256 shades of gray.

As mentioned in the above, in some embodiments, one electronic paper unit may correspond to several pixels in an image. Under this condition, the first pixel includes the several pixels corresponding to the electronic paper unit, and the first pixel value may be an average value of the several pixels, or may be a value of one of the several pixels (e.g., a maximum or minimum value) . Similarly, the second pixel includes the several pixels corresponding to the electronic paper unit, and the second pixel value may be an average value of the several pixels, or a value of one of the several pixels.

The electronic paper display includes a plurality of electronic paper units. The first electronic paper unit is any one of the electronic paper units. The first image and the second image are two consecutive images displayed by the electronic paper display. The electronic paper display displays the second image first and then displays the first image. Referring to the FIG. 4 as an example, in some embodiments, when the second image is the image 1, the first image is the image 2; in some embodiments, when the second image is the image 2, the first image is the image 3; in some embodiments, when the second image is the image 3, the first image is the image 4.

When the electronic paper display displays the first image, a pixel of the first image to be displayed by the first electronic paper unit is a first pixel, and a value of the first pixel is the first pixel value; when the electronic paper display displays the second image, a pixel of the second image be displayed by the first electronic paper unit is a second pixel, and a value of the second pixel is the second pixel value.

Different pixel values correspond to different colors. For example, the first pixel value is black and the second pixel value is white. For another example, the first pixel value is white and the second pixel value is black. For another example, the first pixel value is gray and the second value is black. For another example, the first pixel value and the second pixel value correspond to different shades of gray. For another example, the first pixel value is black and the second pixel value is red.

503, When the first pixel value is different from the second pixel value, the electronic paper display repeatedly generates a first voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time is equal to a maximum repetition time.

The first voltage signal is configured to drive the first electronic paper unit to display the first pixel, and the first repetition time is the number of repetitions to generate the first voltage signal.

For example, when the first pixel value is black and the second pixel value is white, the first signal voltage is the black signal; when the second pixel value is black and the first pixel value is white, the first signal voltage is the white signal.

The input image pattern of the electronic paper unit shown in FIG. 6 is the same as the input image pattern of the electronic paper unit shown in FIG. 4. Therefore, the first three frames are from the image 1, frames F ₃ and F ₄ are from the image 2, frames F ₅ to F ₈ are from the image 3, and frames F ₉ to F ₁₄ are from the image 4.

The adaptive × 4 shown in FIG. 5 is the display pattern with the adaptive multiple writing and the repetition time is 4. The letter W and the letter B shown in the display pattern mean that the voltage signals applied to the electronic paper unit are used to make the electronic paper unit display white and black. The number 0 shown in the display pattern with the forced multiple writing means that there is no voltage signal applied to the electronic paper unit. Referring to FIG. 6, the voltage signals of the frames F ₀ to F ₂ are the white signals, the voltage signals of the frames F ₃ to F ₄ are the black signals, the voltage signals of the frames F ₅ to F ₈ are the white signals, and the voltage signals of the frames F ₉ to F ₁₂ are the black signals.

When the second image is the image 1 and the firs image is the image 2, the first pixel value is black and the second pixel value is white. The first pixel value is black and the second pixel value is white, that is, the first pixel value is different from the second pixel value. Therefore, the electronic paper display repeatedly generates the black signal. However, after the second black signal is generated, the color of the pixel changes from black to white. The image 2 becomes the second image and the image 3 becomes the first image, the first pixel value is white, and the second pixel value is black. The electronic paper display starts to generate the white signal. The repetition time of the white signal is 4 and the color of the pixel changes from white to black. So, the image 3 becomes the second image and the image 4 becomes the first image, the first pixel value is black, and the second pixel value is white. The electronic paper display starts to generate the black signal. When the repetition time of the black signal is 4 (that is, the repetition time of the black signal is equal to a max repetition time) , the color of the pixel does not change, so the electronic paper display stops generating the black signal.

Referring to FIG. 7, white signals are at low level, and black signals are at high level. More specifically, three low level signals (that is, the black signals) are generated to display the black pixel in the image 1. Since the color of the pixel changes from white to black before the repetition time of the white signal (that is, the white signals) reaches the maximum repetition time, the electronic paper display stops generating the white signal and starts to generate high level signals for displaying the black pixel in the image 2. Similarly, since the color of the pixel changes from black to white before the repetition time of the black signal reaches the maximum repetition time, the electronic paper display stops generating the black signal and starts to generate low level signals for displaying the white pixel in the image 3. For the pixel in the image 3, after the repetition time of the white signal reaches the maximum repetition time, the color of the pixel changes to black, so the electronic paper display stops generating the white signal and starts to generate the black signal to display the black pixel in the image 4. For the pixel in the image 4, after the repetition time of the black signal reaches the maximum repetition time, the color of the pixel does not change, so the electronic paper display stops generating the black signal, and the voltage level becomes 0.

Duration of a high/low level signal T ₁ is equal to or less than duration of a frame, duration between two voltage levels T ₂ is equal to or greater than 0, T ₁>T ₂, and a sum of T ₁ and T ₂ is equal to the duration of the frame. For example, if a refresh rate is 24Hz, T ₁+T ₂=41.7ms; if the refresh rate is 12Hz, T ₁+T ₂=83.3ms.

Referring to FIG. 6 and FIG. 7, according to the method shown in FIG. 4, the electronic paper unit can be applied to the same signals several times for improving a contrast ratio. Meanwhile, since the repetition time of the voltage signal is determined according to both the maximum repetition time and a change of the color displayed by the electronic paper unit, the repeated voltage signals do not hurt a pattern of an input image. Therefore, an abnormal image display can be avoided.

In some embodiments, when the first pixel value is the same as the second pixel value, the electronic paper display determines whether a second repetition time is less than the maximum repetition time; when the second repetition time is less than the maximum repetition time, the electronic paper repeatedly generates the second voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the second pixel value or the second repetition time is equal to the maximum repetition time.

The second repetition time is the number of repetitions to generate a second voltage signal, and the second voltage signal is configured to drive the first electronic paper unit to display the second pixel.

Referring to FIG. 8, first three frames belong to the image 1, frames F ₃ to F ₈ belong to the image 2, frames F ₉ to F ₁₂ belong to the image 3, and frames F ₁₃ and F ₁₄ belong to the image 4. The color of the pixel in the image 1 and image 2 does not change, and the color of the pixel in the image 3 and image 4 does not change. When an image displayed by the electronic paper unit changes from the image 1 to the image 2, the electronic paper device determines that the color of the pixel does not change and a repetition time of the white signal is less than the maximum repetition time. Therefore, the electronic paper display continues to generate the white signal. After generating the white signal, the electronic paper display determines that the repetition time of the white signal is equal to the maximum repetition time, and the electronic paper display stops generating the white signal. When the image displayed by the electronic paper unit changes from the image 3 to the image 4, the electronic paper device determines that the color of the pixel does not change and the repetition time of the black signal is equal to the maximum repetition time. Therefore, the electronic paper display stops generating the black signal.

In some embodiments, the electronic paper display may include a counter. The counter is configured to count the number of times the same voltage signal is generated. If the number of times the same voltage signal is generated exceeds the maximum repetition time and the color does not change, a voltage signal generated by the electronic paper display becomes zero. If the color of the pixel changes, a different voltage signal is generated by the electronic paper display, and the counter starts to count again.

Table 1 shows a relationship of the counter, the color of the pixel and the voltage signal corresponding to the FIG. 6.

Table 1

Table 2 shows a relationship of the counter, the color of the pixel and the voltage signal corresponding to the FIG. 8.

Table 2

In some embodiments, the counter starts to count again when the image changes. Table 3 shows a relationship of the counter, the color of the pixel, the image, and the voltage signal corresponding to FIG. 8. In the table 3, the counter starts to count again when the image changes.

Table 3

In some embodiments, the electronic paper display may work in different working modes. For example, the electronic paper display may work in a first working mode or a second working mode. A refresh rate of the first mode is higher than a refresh rate of the second mode. For example, the refresh rate of the first mode is 24Hz, and the refresh rate of the second mode is 8Hz. The first mode may be configured to display a video, a movie, or the like. Therefore, the first working mode can also be called a movie mode or a video mode. The second working mode can be used to display some static contents, such as an electronic book, a picture, or the like. Therefore, the second working mode can also be called a static mode or a text mode.

In some embodiments, the electronic paper display may determine the working mode according to the refresh rate. For example, when the electronic paper display determines that the refresh rate is higher than a refresh rate threshold, the electronic paper display may determine that the electronic paper display works in the first working mode; when the electronic paper display determines that the refresh rate is equal to or lower than the refresh rate threshold, the electronic paper display may determine that the electronic paper works in the second working mode.

In some embodiments, the electronic paper display may determine the working mode according to a displaying task. For example, when the electronic paper display determines that the electronic paper display is displaying a video, the electronic paper display may determine that the electronic paper display works in a first working mode; when the electronic paper display determines that the electronic paper display is displaying an electronic book, the electronic paper display may determine that the electronic paper display works in a second working mode.

In some embodiments, a user of the electronic paper display may set the working mode of the electronic paper display. The electronic paper display can determine the working mode according to a user setting.

Different working modes correspond to different writing methods. For example, in some embodiments, when the electronic paper display works in the first working mode, the electronic paper display may use the adaptive multiple writing; when the electronic paper display works in the second working mode, the electronic paper may use the single writing or the forced multiple writing.

In some embodiments, the electronic paper display may support more than two working modes. For example, the electronic paper display may work in the first working mode, the second working mode, or a third working mode. The refresh rate of the first working mode is higher than the refresh rate of the second working mode, and the refresh rate of the second working mode is higher than a refresh rate of the third working mode. Similarly, the electronic paper display may determine the working mode according to the refresh rate, displaying content, or user setting. When the electronic paper display works in the first working mode, the electronic paper display may use the adaptive multiple writing; when the electronic paper display works in the second working mode, the electronic paper display may use the forced multiple writing; when the electronic paper display works in the third working mode, the electronic paper display may use the single writing.

In some embodiments, the electronic paper display may support different levels of the adaptive multiple writing. Different levels of the adaptive multiple writing correspond to different maximum repetition times. For example, a maximum repetition time of a first level adaptive multiple writing is 3, a maximum repetition time of a second level adaptive multiple writing is 4, and a maximum repetition time of a third level adaptive multiple writing is 5. In some embodiments, different levels of the adaptive multiple writing correspond to different working modes. The repetition time of each level of the adaptive multiple writing is preset or set by the user of the electronic paper display.

Similarly, the electronic paper display may support different levels of the forced multiple writing. Different levels of the forced multiple writing correspond to different maximum repetition times. For example, a maximum repetition time of a first level forced multiple writing is 3, a maximum repetition time of a second level forced multiple writing is 4, and a maximum repetition time of a third level forced multiple writing is 5. In some embodiments, different levels of the forced multiple writing correspond to different working modes. The repetition time of each level of the forced multiple writing is preset or set by the user of the electronic paper display.

In some embodiments, the electronic paper display supports pre-activation. The pre-activation is realized by a set of opposite pulses. Each pulse is very short, such as the shortest one pulse. There are two types of sets of opposite pulses, one is positive at first, then negative, and the other one is negative at first, then positive. The pre-activation is used when the pixel value is changed and is used one waveform before changing the pixel value. And selection of the set depends on a pixel value of the waveform after the pixel value has changed. If the following waveform is positive, set the negative first, then the positive is used as a pre-activation waveform. In another word, when the first repetition time N ₁ is greater than one and the value of the pixel to be displayed by the first electronic paper unit is different from the first pixel value, a last one of N ₁ first voltage signals includes a set of opposite pulses (that is, the pre-activation) . In some embodiments, when a color of the first pixel is black and a color of the pixel to be displayed by the first electronic paper unit is white, the positive pulse precedes the negative pulse; when the color of the first pixel is white and the color of the pixel to be displayed by the first electronic paper unit is black, the negative pulse precedes the positive pulse.

FIG. 9 shows a waveform including pre-activation. A display pattern of an electronic paper unit shown in FIG. 9 is the display pattern of the electronic paper unit shown in FIG. 7.

Compared to the waveform shown in FIG. 7, waveforms of a third frame, a fifth frame, and a ninth frame are the pre-activation. For example, a color of a pixel in the third frame is white, and the color of the pixel changes from white to black in a fourth frame. Therefore, for the fourth frame, a set of opposite pulses includes a negative pulse and a positive pulse in sequence. For the fifth frame, since the color of the pixel in the fifth frame is black and the color of the pixel in a sixth frame is white, the set of opposite pulses includes the positive pulse and the negative pulse in sequence. For the ninth frame, the color of the pixel in the ninth frame is white and the color of the pixel in a tenth frame is black, so the set of positive pulses in the ninth frame includes the negative pulse and the positive pulse in sequence.

In other embodiments, when a color of the first pixel is black and a color of the pixel to be displayed by the first electronic paper unit is white, the negative pulse precedes the positive pulse; when the color of the first pixel is white and the color of the pixel to be displayed by the first electronic paper unit is black, the positive pulse precedes the negative pulse.

FIG. 10 is a schematic block diagram of an electronic device according to an embodiment of the present application. As shown in FIG. 10, the electronic device may include a determining module 1010 and a signal generating module 1020.

The determining module 1010 is configured to determine that an electronic paper display is to display a first image.

The determining module 1010 is further configured to determine whether a first pixel value is the same as a second pixel value. The first pixel value is a value of a first pixel in the first image, the second pixel value is a value of a second pixel in a second image. The second image is an image displayed by the electronic paper display before displaying the first image, and the second pixel is displayed by a first electronic paper unit of the electronic paper display.

The signal generating module 1020 is configured to repeatedly generate a first voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time is equal to a maximum repetition time when the determining module 1010 determines that the first pixel value is different from the second pixel value. The first voltage signal is configured to drive the first electronic paper unit to display the first pixel, and the first repetition time is the number of repetitions to generate the first voltage signal.

In some embodiments, the electronic device 1000 may be a component of an electronic paper display. For example, the electronic device may be a processor or a driving circuit in the electronic paper display.

In some embodiments, the electronic device 1000 may be an electronic paper display.

In some embodiments, the electronic device 1000 may be a terminal device including an electronic paper display.

When the electronic device 1000 is an electronic paper display or a terminal device including the electronic paper display, the determining module 1010 and the signal generating module 1020 may be implemented by a processor or a circuit. When the electronic device 1000 is a processor or a circuit, the determining module 1010 and the signal generating module 1020 may be implemented by a logical circuit in the processor or a logical sub-circuit in the circuit.

Details of functions of the determining module 1010 and the signal generating module 1020, and the corresponding technical effects may refer to the above-mentioned embodiments.

An embodiment of the present application further provides a computer readable storage medium, where the computer readable stores an instruction. When the instruction runs on an electronic device, the electronic device is configured to perform the method in the foregoing embodiments.

An embodiment of the present application further provides an electronic device. The electronic device includes a processor and a memory. The processor is connected to the memory. The memory is configured to store an instruction, and the processor is configured to execute the instruction. When the processor executes the instruction stored in the memory, the processor is configured to perform the method in the foregoing embodiments.

An embodiment of the present application further provides a chip system. The chip systems includes a memory and a processor, where the memory is configured to store a computer program, and the processor is configured to invoke the computer program from the memory and run the computer program, so that an electronic device on which the chip system is disposed performs the method in the foregoing embodiments.

An embodiment of the present application further provides a computer program. When the computer program runs on an electronic device, the electronic device is configured to perform the method in the foregoing embodiments.

An embodiment of the present application further provides an electronic paper display. The electronic paper display includes the electronic device in the foregoing embodiments. For example, the electronic paper display may be the electronic paper display 200 shown in FIG. 2.

An embodiment of the present application further provides a terminal device. The terminal device includes the electronic paper display in the foregoing embodiments. For example, the terminal device may be the terminal device 100 shown in FIG. 1.

It may be clearly understood by a person skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and module, refer to a corresponding process in the foregoing method embodiment. Details are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus embodiment is merely an example. For example, the module division is merely logical function division and may be other division in actual implementation. For example, a plurality of modules or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces. The indirect couplings or communication connections between the apparatuses or modules may be implemented in electronic, mechanical, or other forms.

The modules described as separate parts may be or may not be physically separate, and parts displayed as modules may be or may not be physical modules, may be located in one position, or may be distributed on a plurality of modules. Some or all of the modules may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

In addition, functional modules in the embodiments of this application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module.

The foregoing descriptions are merely specific implementations of the present application, but are not intended to limit the protection scope of the present application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present application shall fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for displaying an image on an electronic paper display, wherein the method comprising:

determining that the electronic paper display is to display a first image;

determining whether a first pixel value is the same as a second pixel value, wherein the first pixel value is a value of a first pixel in the first image, the second pixel value is a value of a second pixel in a second image, the second image is an image displayed by the electronic paper display before displaying the first image, the second pixel is displayed by a first electronic paper unit of the electronic paper display;

when the first pixel value is different from the second pixel value, repeatedly generating a first voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time equals a maximum repetition time, wherein the first voltage signal is configured to drive the first electronic paper unit to display the first pixel, and wherein the first repetition time is the number of repetitions to generate the first voltage signal.
The method according to claim 1, further comprising:

when the first pixel value is the same as the second pixel value, determining whether a second repetition time is less than the maximum repetition time, wherein the second repetition time is the number of repetitions to generate a second voltage signal, and wherein the second voltage signal is configured to drive the first electronic paper unit to display the second pixel;

when the second repetition time is less than the maximum repetition time, repeatedly generating the second voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the second pixel value or the second repetition time is equal to the maximum repetition time.
The method according to claim 1 or 2, before the repeatedly generating a first voltage signal, further comprising:

determining a working mode of the electronic paper display, wherein the working mode of the electronic paper display comprises a first working mode or a second working mode, and wherein a refresh rate of the first working mode is higher than a refresh rate of the second working mode;

when the working mode of the electronic paper display is the first working mode, determining the maximum repetition time is a first maximum repetition time;

when the working mode of the electronic paper display is the second working mode, determining the maximum repetition time is a second maximum repetition time, wherein the first maximum repetition time is larger than the second maximum repetition time.
The method according to claim 1 or 2, wherein before the repeatedly generating a first voltage signal, further comprising:

determining a working mode of the electronic paper display is a first working mode;

determining the maximum repetition time is a first maximum repetition time;

after repeatedly generating the first voltage signal, the method further comprising:

determining that the electronic paper display is to display a third image;

determining that the second pixel value is different from a third pixel value, wherein the third pixel value is a value of a third pixel in the third image;

determining the working mode of the electronic paper display is a second working mode, wherein a refresh rate of the first working mode is higher than a refresh rate of the second working mode;

repeatedly generating a third voltage signal until a third repetition time equals a second maximum repetition time, wherein the third voltage signal is configured to drive the first electronic paper unit to display the third pixel, wherein the third repetition time is the number of repetitions to generate the third voltage signal, and wherein the first maximum repetition time is larger than the second maximum repetition time.
The method according to any one of claims 1 to 4, wherein when the first repetition time N ₁ is greater than one and the value of the pixel to be displayed by the first electronic paper unit is different from the first pixel value, a last one of N ₁ first voltage signals comprises a set of opposite pulses.
The method according to claim 5, wherein the set of opposite pulses comprises a positive pulse and a negative pulse;

when a color of the first pixel is black and a color of the pixel to be displayed by the first electronic paper unit is white, the positive pulse precedes the negative pulse;

when the color of the first pixel is white and the color of the pixel to be displayed by the first electronic paper unit is black, the negative pulse precedes the positive pulse.
An electronic device, wherein comprising:

a determining module, configured to determine that an electronic paper display is to display a first image;

the determining module, further configured to determine whether a first pixel value is the same as a second pixel value, wherein the first pixel value is a value of a first pixel in the first image, the second pixel value is a value of a second pixel in a second image, the second image is an image displayed by the electronic paper display before displaying the first image, the second pixel is displayed by a first electronic paper unit of the electronic paper display;

a signal generating module configured to repeatedly generate a first voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the first pixel value or a first repetition time equals a maximum repetition time when the determining module determines that the first pixel value is different from the second pixel value, wherein the first voltage signal is configured to drive the first electronic paper unit to display the first pixel, and wherein the first repetition time is the number of repetitions to generate the first voltage signal.
The electronic device according to claim 7, wherein the determining module is further configured to determine whether a second repetition time is less than the maximum repetition time when the first pixel value is the same as the second pixel value, wherein the second repetition time is the number of repetitions to generate a second voltage signal, and wherein the second voltage signal is configured to drive the first electronic paper unit to display the second pixel;

the signal generating module is further configured to repeatedly generate the second voltage signal until a value of a pixel to be displayed by the first electronic paper unit changes from the second pixel value or the second repetition time is equal to the maximum repetition time when the determining module determines that the second repetition time is less than the maximum repetition time.
The electronic device according to claim 7 or 8, wherein the determining module is further configured to determine a working mode of the electronic paper display before the repeatedly generating a first voltage signal, wherein the working mode of the electronic paper display comprises a first working mode or a second working mode, and wherein a refresh rate of the first working mode is higher than a refresh rate of the second working mode;

the determining module is further configured to determine that the maximum repetition time is a first maximum repetition time when the working mode of the electronic paper display is the first working mode;

the determining module is further configured to determine that the maximum repetition time is a second maximum repetition time when the working mode of the electronic paper display is the second working mode, wherein the first maximum repetition time is larger than the second maximum repetition time.
The electronic device according to claim 7 or 8, wherein the determining module is further configured to determine a working mode of the electronic paper display is a first working mode and determine the maximum repetition time is a first maximum repetition time before the repeatedly generating the first voltage signal;

the determining module is further configured to determine the electronic paper display to display a third image after repeatedly generating the first voltage;

the determining module is further configured to determine that the second pixel value is different from a third pixel value, and determine that the working mode of the electronic paper display is a second working mode, wherein the third pixel value is a value of a third pixel in the third image, and wherein a refresh rate of the first working mode is higher than a refresh rate of the second working mode;

the signal generating module is further configured to repeatedly generate a third voltage signal until a third repetition time equals a second maximum repetition time, wherein the third voltage signal is configured to drive the first electronic paper unit to display the third pixel, wherein the third repetition time is the number of repetitions to generate the third voltage signal, and wherein the first maximum repetition time is larger than the second maximum repetition time.
The electronic device according to any one of claims 7 to 10, wherein when the first repetition time N ₁ is greater than one and the value of the pixel to be displayed by the first electronic paper unit is different from the first pixel value, a last one of N ₁ first voltage signals comprises a set of opposite pulses.
The electronic device according to claim 11, wherein the set of opposite pulses comprises a positive pulse and a negative pulse;

when a color of the first pixel is black and a color of the pixel to be displayed by the first electronic paper unit is white, the positive pulse precedes the negative pulse;

when the color of the first pixel is white and the color of the pixel to be displayed by the first electronic paper unit is black, the negative pulse precedes the positive pulse.
An electronic device, comprising a memory and a processor, wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program from the memory and run the computer program, so that an electronic paper display on which the electronic device is disposed performs the method according to any one of claims 1 to 6.
An electronic paper display, comprising an electronic device according to any one of claims 7 to 13.
A terminal device, comprising an electronic paper display according to claim 14.
A chip system, comprising a memory and a processor, wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program from the memory and run the computer program, so that an electronic device on which the chip system is disposed performs the method according to any one of claims 1 to 6.
A computer readable storage medium, wherein the computer readable storage medium stores instructions, and when the instructions run on an electronic device, the electronic device is enabled to perform the method according to any one of claims 1 to 6.
A computer program product, wherein when the computer program product runs on an electronic device, the electronic device is enabled to perform the method according to any one of claims 1 to 6.