A display optimization method for low-resolution images of double-layer ink electronic paper displays

Abstract

The present invention discloses a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display, comprising: determining whether the first image is a low-resolution image in response to the electronic paper display receiving a display screen signal corresponding to a first image; obtaining a display pixel group in response to the first image being a low-resolution image; obtaining a first upper-layer driving voltage and a second lower-layer driving voltage corresponding to the display grayscale value corresponding to the display pixel group based on the display grayscale value; driving native pixels using the first upper-layer driving voltage and the second lower-layer driving voltage of the display pixel group to which they belong, and driving interpolated pixels using the first upper-layer driving voltage of the display pixel group to which they belong and the second lower-layer driving voltage of the adjacent display pixel group. The present invention leverages the inherent characteristics of electronic paper displays to achieve image super-resolution, thereby improving the display quality of the electronic paper display.

Description

Technical Field

[0001] The present invention relates to the field of electronic paper display, and in particular to a display optimization method for low-resolution images of a double-layer ink 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 considerable attention due to their paper-like appearance, low power consumption, and environmentally friendly advantages. Compared to 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 pixels by applying voltage between electrodes, causing 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] Existing electronic paper displays are unable to convert low-resolution images into suitable high-resolution images. Therefore, when electronic paper displays display low-resolution images without image super-resolution algorithms, the display effect is poor. Summary of the Invention

[0005] In view of some of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a display optimization method for low-resolution images of a double-layer ink electronic paper display, aiming to achieve image super-resolution through the characteristics of the electronic paper display itself and improve the display effect of the electronic paper display.

[0006] To achieve the above object, the present invention provides a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display, the method comprising:

[0007] Step S1: In response to an electronic paper display receiving a display image signal corresponding to a first image, obtaining a display grayscale value of the display image signal in each display pixel of the electronic paper display; wherein the display pixel of the electronic paper display has a double-layer ink structure, including an upper layer of primary color ink and a lower layer of black ink, and the upper layer of primary color ink and the lower layer of black ink are driven separately, and the ink aperture ratios of the upper layer of primary color ink and the lower layer of black ink jointly determine the grayscale value of the corresponding display pixel; the larger the grayscale value of the display pixel, the larger the ink aperture ratio of the upper layer of primary color ink and the smaller the ink aperture ratio of the lower layer of black ink;

[0008] Step S2: determining whether the first image is a low-resolution image based on the grayscale displayed in each display pixel of the electronic paper display by the display image signal; if so, proceeding to step S3; if not, performing normal display;

[0009] Step S3: In response to the first image being a low-resolution image, obtaining a display pixel group; wherein the display pixel group is composed of a plurality of adjacent display pixels having the same corresponding display grayscale value, the display pixel group includes native pixels and interpolated pixels, and the interpolated pixels are located between the native pixels of the display pixel group and the native pixels of the adjacent display pixel group;

[0010] Step S4: obtaining a first upper-layer driving voltage and a second lower-layer driving voltage corresponding to the display grayscale value according to the display grayscale value corresponding to the display pixel group; driving the native pixel using the first upper-layer driving voltage and the second lower-layer driving voltage of the display pixel group to which it belongs, and driving the interpolated pixel using the first upper-layer driving voltage of the display pixel group to which it belongs and the second lower-layer driving voltage of the adjacent display pixel group, so that the actual grayscale value presented by the interpolated pixel is deflected toward the display grayscale value corresponding to the adjacent display pixel group; wherein the magnitude of the driving voltage determines the magnitude of the ink aperture ratio.

[0011] Optionally, in step S2, judging whether the first image is a low-resolution image according to the display grayscale of each display pixel of the electronic paper display by the display image signal includes:

[0012] Determine whether the display grayscale values ​​corresponding to the same number of adjacent display pixels in the electronic paper display are all the same; if so, the first image is a low-resolution image; if not, the first image is not a low-resolution image; wherein, when the resolution of the first image is lower than the resolution of the electronic paper display, the first image is determined to be a low-resolution image.

[0013] Optionally, the interpolated pixels adjacent to the native pixels include horizontal adjacency, vertical adjacency, and diagonal adjacency.

[0014] Optionally, when the display pixel group includes four display pixels, the four display pixels are arranged in a "field" shape. If one of them is determined as the native pixel, the other three are the interpolated pixels.

[0015] Optionally, the display pixel is a rectangular structure, including a lower white hydrophobic layer, with a lower layer of black ink disposed above the lower white hydrophobic layer, a black driving electrode disposed below the lower white hydrophobic layer, a fluid common electrode disposed above the lower layer of black ink, an upper layer of primary color ink disposed above the fluid common electrode, an upper transparent hydrophobic layer disposed on the upper layer of primary color ink, and a first primary color driving electrode disposed above the upper transparent hydrophobic layer.

[0016] Optionally, the display pixel is a single-color pixel, and the electronic paper display is a black-and-white display.

[0017] Optionally, the display pixel includes three primary color sub-pixel units, namely a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit, and the electronic paper display is a color display. [[ID=​​​​The beneficial effects of the present invention are as follows: when it is determined that the first image to be displayed is a low-resolution image, the present invention obtains a display pixel group, the display pixel group including native pixels and interpolated pixels; according to the display grayscale value corresponding to the display pixel group, a first upper-layer driving voltage and a second lower-layer driving voltage corresponding to the display grayscale value are obtained; the native pixels are driven by the first upper-layer driving voltage and the second lower-layer driving voltage of the display pixel group to which they belong, and the interpolated pixels are driven by the first upper-layer driving voltage of the display pixel group to which they belong and the second lower-layer driving voltage of the adjacent display pixel group, so that the actual grayscale value presented by the interpolated pixel is deflected toward the display grayscale value corresponding to the adjacent display pixel group. When the display grayscale value corresponding to the adjacent display pixel group is greater than that of the current display pixel group, the corresponding black ink aperture ratio will be smaller than that of the current display pixel group. Therefore, when the interpolated pixel of the current display pixel group is driven by the second lower layer driving voltage of the adjacent display pixel group, the black ink aperture ratio formed by the interpolated pixel will be smaller than that of the current display pixel group. When the primary color ink aperture ratio remains unchanged, the actual grayscale value formed by the two together will be between the display grayscale value corresponding to the adjacent display pixel group and the display grayscale value corresponding to the current display pixel group, forming an interpolation, thereby restoring the image content and achieving the effect of improving image resolution. Similarly, when the display grayscale value corresponding to the adjacent display pixel group is smaller than that of the current display pixel group, on the contrary, the actual grayscale value of the interpolated pixel can also be made between the display grayscale value corresponding to the adjacent display pixel group and the display grayscale value corresponding to the current display pixel group. Compared with the prior art, the present invention does not require complex algorithm support and can achieve image super-resolution and improve the display effect of the electronic paper display based on the structural characteristics of the electronic paper display itself.

[0020] In summary, the present invention can achieve image super-resolution by utilizing the inherent characteristics of the electronic paper display, thereby improving display quality, reducing the image super-resolution processing flow, and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to a specific embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a display pixel provided by a specific embodiment of the present invention;

[0023] Figure 3 is a schematic diagram illustrating adjacent display pixel groups provided by a specific embodiment of the present invention;

[0024] Figure 4 1 is a schematic diagram illustrating driving of a display pixel group provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention discloses a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display. Those skilled in the art can refer to the contents of this article and appropriately improve the technical details. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and 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 relevant personnel can modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of the present invention to implement and apply the technology of the present invention.

[0026] The applicant's research has found that existing electronic paper displays are unable to convert low-resolution images into compatible high-resolution images. Therefore, when electronic paper displays display low-resolution images without image super-resolution processing, the display effect is poor.

[0027] Therefore, the embodiment of the present invention provides a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display, such as Figure 1 As shown, the method includes:

[0028] Step S1: In response to the electronic paper display receiving a display picture signal corresponding to a first image, obtaining a display grayscale value of the display picture signal in each display pixel of the electronic paper display.

[0029] Among them, the display pixels of the electronic paper display are a double-layer ink structure, including an upper layer of primary color ink and a lower layer of black ink, and the upper layer of primary color ink and the lower layer of black ink are driven separately. The ink opening ratios of the upper layer of primary color ink and the lower layer of black ink jointly determine the grayscale value of the corresponding display pixel. The larger the grayscale value of the display pixel, the greater the ink opening ratio of the upper layer of primary color ink and the smaller the ink opening ratio of the lower layer of black ink.

[0030] It should be noted that in an embodiment of the present invention, the opening ratios of the upper primary color ink and the lower black ink corresponding to different grayscale values ​​of the display pixels under standard display conditions (i.e., displaying an image with adapted resolution) are different. The larger the grayscale value, the larger the ink opening ratio of the upper primary color ink and the smaller the ink opening ratio of the lower black ink, so that a one-to-one correspondence can be ensured.

[0031] In this specific embodiment, the ink aperture ratio may be positively correlated or negatively correlated with the driving voltage. Generally, the ink aperture ratio is proportional to the driving voltage. The greater the driving voltage, the greater the ink aperture ratio.

[0032] In this specific embodiment, Figure 2As shown, the display pixel is a rectangular structure, including a lower white hydrophobic layer 201. Above the lower white hydrophobic layer 201, there is a lower layer of black ink 202. Below the lower white hydrophobic layer 201, there is a black driving electrode 203. Above the lower layer of black ink 202, there is a fluid common electrode 204. Above the fluid common electrode 204, there is an upper layer of primary color ink 205. The upper layer of primary color ink 205 is provided with an upper transparent hydrophobic layer 206. Above the upper transparent hydrophobic layer 206, there is a first primary color driving electrode 207.

[0033] In this specific embodiment, the contraction positions of the upper layer of primary color ink and the lower layer of black ink are opposite, and the extension directions are opposite.

[0034] It should be noted that such an unfolding structure avoids mutual occlusion when the two inks are unfolded simultaneously, making the combined effect of the two more obvious.

[0035] Step S2: According to the display gray level in each display pixel of the electronic paper display for the display screen signal, determine whether the first image is a low-resolution image. If so, proceed to step S3; if not, perform normal display.

[0036] In this specific embodiment, in step S2, determining whether the first image is a low-resolution image according to the display gray level in each display pixel of the electronic paper display for the display screen signal includes:

[0037] Determine whether the display gray level values corresponding to the same number and adjacent display pixels in the electronic paper display are all the same. If so, the first image is a low-resolution image; if not, the first image is not a low-resolution image. Among them, when the resolution of the first image is lower than the resolution of the electronic paper display, it is determined that the first image is a low-resolution image.

[0038] It should be noted that when the resolution of the first image is lower than the resolution of the electronic paper display, there will necessarily be multiple adjacent display pixels with the same display gray level value. For example, in a 2k image on a 4k display, four pixels in a "field" shape are required to display one pixel of the image.

[0039] Step S3: In response to the first image being a low-resolution image, obtain a display pixel group.

[0040] Among them, the display pixel group is composed of multiple adjacent display pixels with the same corresponding display gray level value. The display pixel group includes native pixels and interpolation pixels. The interpolation pixels are located between the native pixels of the display pixel group to which they belong and the native pixels of the adjacent display pixel group.

[0041] In this specific embodiment, the interpolation pixels being adjacent to the native pixels includes horizontal adjacency, vertical adjacency, and diagonal adjacency.

[0042] In this specific embodiment, when the display pixel group includes four display pixels, the four display pixels are arranged in a "field" shape. If one of them is determined as the native pixel, the other three are interpolation pixels.

[0043] In this specific embodiment, as Figure 3 shown, Figure 3 in which, 301 is the current display pixel group, and the three lines 302, 303, and 304 are respectively the schematic lines of the interpolation pixels adjacent horizontally, vertically, and diagonally to the current display pixel group.

[0044] Step S4: Obtain the first upper driving voltage and the second lower driving voltage corresponding to the display gray scale value according to the display gray scale value corresponding to the display pixel group; drive the native pixel with the first upper driving voltage and the second lower driving voltage of its所属 display pixel group, and drive the interpolation pixel with the first upper driving voltage of its所属 display pixel group and the second lower driving voltage of its adjacent display pixel group, so that the actual gray scale value presented by the interpolation pixel deflects towards the display gray scale value corresponding to its adjacent display pixel group.

[0045] Among them, the magnitude of the driving voltage determines the magnitude of the ink opening rate.

[0046] In this specific embodiment, it can be as Figure 4 shown, Figure 4 It should be noted that there seems to be some inaccuracies in the text you provided, such as "其所属" which is not clear in meaning. I have translated it as best as possible based on the context. You may need to check and correct the original text for more accurate translation results.There are 4 display pixel groups with corresponding display grayscale values ​​of 110 (upper left display pixel group), 100 (upper right display pixel group), 120 (lower left display pixel group) and 130 (lower right display pixel group), respectively. The first upper layer driving voltage corresponding to the display grayscale value of 100 forms an opening rate of 0.5 (the percentage of the extended area to the pixel area) of the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.65 of the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 110 forms an opening rate of 0.52 of the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.60 of the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 120 forms an opening rate of 0.54 of the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.55 of the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 120 forms an opening rate of 0.54 of the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.55 of the black ink; The driving voltage forms an opening rate of 0.56 for the primary color ink and a second lower driving voltage forms an opening rate of 0.50 for the black ink; 401 in the upper left display pixel group is a native pixel, 402 is an interpolated pixel adjacent to the upper right display pixel group, 403 is an interpolated pixel adjacent to the lower left display pixel group, and 404 is an interpolated pixel adjacent to the lower right display pixel group; therefore, the primary color ink opening rate corresponding to 401 is 0.52 and the black ink opening rate is 0.60, which will display an actual grayscale value of 110; the primary color ink opening rate corresponding to 402 is 0.52 and the black ink opening rate is 0.65, and the actual grayscale value displayed is greater than 100 and less than 110, forming an interpolation between the native pixels of the upper left display pixel group and the native pixels of the upper right display pixel group; the primary color ink opening rate corresponding to 403 is 0.52 and the black ink opening rate is 0.50, and the actual grayscale value displayed is greater than 110 and less than 130, forming an interpolation between the native pixels of the upper left display pixel group and the native pixels of the lower right display pixel group. The primary color ink opening ratio corresponding to 404 is 0.52 and the black ink opening ratio is 0.55. The actual grayscale value displayed is greater than 110 and less than 120, and is interpolated between the native pixels of the upper left display pixel group and the native pixels of the lower left display pixel group.

[0047] This embodiment is for illustration only, and the specific parameters in actual application must be consistent with the equipment conditions.

[0048] In this specific embodiment, the display pixels are single-color pixels, and the electronic paper display is a black-and-white display. The embodiment of the present invention can be applied to black-and-white screen displays.

[0049] In another specific embodiment, the display pixel includes three primary color sub-pixel units, namely a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit, and the electronic paper display is a color display. The embodiment of the present invention can be applied to color screen displays.

[0050] In an embodiment of the present invention, when it is determined that a first image to be displayed is a low-resolution image, a display pixel group is obtained, the display pixel group including native pixels and interpolated pixels; a first upper-layer driving voltage and a second lower-layer driving voltage corresponding to the display grayscale value are obtained according to a display grayscale value corresponding to the display pixel group; the native pixels are driven using the first upper-layer driving voltage and the second lower-layer driving voltage of the display pixel group to which they belong, and the interpolated pixels are driven using the first upper-layer driving voltage of the display pixel group to which they belong and the second lower-layer driving voltage of the adjacent display pixel group, so that the actual grayscale value presented by the interpolated pixel is deflected toward the display grayscale value corresponding to the adjacent display pixel group. When the display grayscale value corresponding to the adjacent display pixel group is greater than that of the current display pixel group, the corresponding black ink aperture ratio will be smaller than that of the current display pixel group. Therefore, when the interpolated pixels of the current display pixel group are driven using the second lower layer driving voltage of the adjacent display pixel group, the black ink aperture ratio formed by the interpolated pixels will be smaller than that of the current display pixel group. When the primary color ink aperture ratio remains unchanged, the actual grayscale value formed by the two together will be between the display grayscale value corresponding to the adjacent display pixel group and the display grayscale value corresponding to the current display pixel group, forming an interpolation, thereby restoring the image content and achieving the effect of improving image resolution. Similarly, when the display grayscale value corresponding to the adjacent display pixel group is smaller than that of the current display pixel group, on the contrary, the actual grayscale value of the interpolated pixels can also be made between the display grayscale value corresponding to the adjacent display pixel group and the display grayscale value corresponding to the current display pixel group. Compared with the prior art, the embodiments of the present invention do not require complex algorithm support and can achieve image super-resolution and improve the display effect of the electronic paper display based on the structural characteristics of the electronic paper display itself.

[0051] In summary, the embodiments of the present invention can achieve image super-resolution by leveraging the inherent characteristics of the electronic paper display, thereby improving display quality, reducing the image super-resolution processing flow, and saving resources.

[0052] 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.

[0053] 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.

[0054] 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 optimizing the display of low-resolution images on a double-layer ink electronic paper display, characterized in that: The method includes: Step S1: In response to the electronic paper display receiving a display screen signal corresponding to a first image, obtaining the display gray scale value of the display screen signal in each display pixel of the electronic paper display; wherein, the display pixel of the electronic paper display has a double-layer ink structure, including an upper primary color ink and a lower black ink respectively, and the upper primary color ink and the lower black ink are driven separately, and the ink aperture ratios of the upper primary color ink and the lower black ink jointly determine the gray scale value of the corresponding display pixel. The larger the gray scale value of the display pixel, the larger the ink aperture ratio of the upper primary color ink, and the smaller the ink aperture ratio of the lower black ink; Step S2: According to the display gray scale of the display screen signal in each display pixel of the electronic paper display, determining whether the first image is a low-resolution image. If so, proceed to step S3; if not, perform normal display; Step S3: In response to the first image being a low-resolution image, obtaining a display pixel group; wherein, the display pixel group is composed of multiple adjacent display pixels with the same corresponding display gray scale value, and the display pixel group includes native pixels and interpolation pixels, and the interpolation pixels are located between the native pixels of the display pixel group to which they belong and the native pixels of the adjacent display pixel group; Step S4: According to the display gray scale value corresponding to the display pixel group, obtaining a first upper driving voltage and a second lower driving voltage corresponding to the display gray scale value; driving the native pixels with the first upper driving voltage and the second lower driving voltage of the display pixel group to which they belong, and driving the interpolation pixels with the first upper driving voltage of the display pixel group to which they belong and the second lower driving voltage of the adjacent display pixel group to which they belong, so that the actual gray scale value presented by the interpolation pixels deflects towards the display gray scale value corresponding to the adjacent display pixel group; wherein, the magnitude of the driving voltage determines the magnitude of the ink aperture ratio.

2. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: In step S2, according to the display gray scale of the display screen signal in each display pixel of the electronic paper display, determining whether the first image is a low-resolution image includes: Determining whether the display gray scale values corresponding to the same number and adjacent display pixels in the electronic paper display are all the same. If so, the first image is a low-resolution image; if not, the first image is not a low-resolution image; wherein, when the resolution of the first image is lower than the resolution of the electronic paper display, it is determined that the first image is a low-resolution image.

3. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: The interpolation pixels are adjacent to the native pixels including horizontally adjacent, vertically adjacent, and diagonally adjacent.

4. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: When the display pixel group includes four display pixels, the four display pixels are arranged in a "field" shape. If one of them is determined as the native pixel, the other three are interpolation pixels.

5. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: The display pixel has a rectangular structure, including a lower white hydrophobic layer, a lower black ink layer is arranged above the lower white hydrophobic layer, a black drive electrode is arranged below the lower white hydrophobic layer, a fluid common electrode is arranged above the lower black ink layer, an upper primary color ink layer is arranged above the fluid common electrode, an upper transparent hydrophobic layer is arranged above the upper primary color ink layer, and a first primary color drive electrode is arranged above the upper transparent hydrophobic layer.

6. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: The display pixels are single-color pixels, and the electronic paper display is a black and white display.

7. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: The display pixel includes three primary color sub-pixel units, namely a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit. The electronic paper display is a color display.

8. The method for optimizing the display of low-resolution images on a double-layer ink electronic paper display according to claim 1, characterized in that: The upper layer of primary color ink and the lower layer of black ink have opposite contraction positions and opposite extension directions.

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