Display optimization method for low-resolution image of double-layer ink electronic paper display

Abstract

The invention discloses a display optimization method for a low-resolution image of a double-layer ink electronic paper display, which comprises the following steps: in response to a display picture signal corresponding to a first image received by the electronic paper display, judging whether the first image is a low-resolution image; obtaining a display pixel group in response to the fact that the first image is a low-resolution image; obtaining a first upper-layer driving voltage and a second lower-layer driving voltage corresponding to the display gray-scale value according to the display gray-scale value corresponding to the display pixel group; driving the native pixel by adopting the first upper-layer driving voltage and the second lower-layer driving voltage of the display pixel group to which the native pixel belongs, and driving the interpolation pixel by adopting the first upper-layer driving voltage of the display pixel group to which the interpolation pixel belongs and the second lower-layer driving voltage of the adjacent display pixel group to which the interpolation pixel belongs. The image super-resolution is realized through the characteristics of the electronic paper display, and the display effect of the electronic paper display is improved.

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 the main development direction of new display technologies. Electronic paper display technology has the characteristics of ultra-low power consumption and comfortable reading in outdoor light environments. It is one of the ideal carriers of portable and wearable flexible display terminals. Therefore, its flexibility is currently a hot topic in international research. In recent years, electronic paper display devices have attracted much attention due to their advantages such as paper-like appearance, low power consumption, and environmental protection. Compared with electrophoretic electronic paper, electrowetting electronic paper has a faster response speed and can achieve color display. It is an electronic paper display that can achieve high-resolution video playback.

[0003] Electrowetting electronic paper display technology changes the state of pixels by applying voltage between the plates to shrink or spread the ink. The pixel conversion is very fast, which can achieve high-resolution video playback. Compared with traditional LCD and other display methods, the backlight of traditional LCD consumes 90% of the energy, and the efficiency of its reflective layer is also very low; electrowetting technology does not require backlight, the reflective layer efficiency can reach 40%, and the power consumption is also lower. In addition, electrowetting technology uses oil film as raw material and does not require the complex chemical components used in LCD, so it is more stable in extreme environments such as low temperature. Electrowetting display panels can display using ambient light, and electronic devices that are often used in sunlight are more suitable for using electrowetting display panels. Electrowetting panels also have the advantages of simple structure, flexible display, high brightness, high contrast and wide viewing angle.

[0004] The prior art electronic paper display itself cannot convert a low-resolution image into an adaptive high-resolution image. Therefore, when the electronic paper display displays a low-resolution image, the display effect is poor if it is not processed by an image super-resolution algorithm. Summary of the invention

[0005] In view 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 of a double-layer ink electronic paper display, the method comprising:

[0007] 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; wherein the display pixel of the electronic paper display is a double-layer ink structure, comprising an upper layer of primary color ink and a lower layer of black ink, respectively, and the upper layer of primary color ink and the lower layer of black ink are driven separately, and 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, and the larger the grayscale value of the display pixel, the larger 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;

[0008] Step S2, judging whether the first image is a low-resolution image according to the display grayscale of each display pixel of the display image signal, and 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 to which it belongs and the native pixels of the adjacent display pixel group;

[0010] Step S4, according to the display grayscale value corresponding to the display pixel group, obtaining a first upper driving voltage and a second lower driving voltage corresponding to the display grayscale value; driving the native pixel by using the first upper driving voltage and the second lower driving voltage of the display pixel group to which it belongs, and driving the interpolated pixel by using the first upper driving voltage of the display pixel group to which it belongs and the second lower 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 size of the driving voltage determines the size of the ink aperture ratio.

[0011] Optionally, 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 picture signal in step S2 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, it is determined that the first image is a low-resolution image.

[0013] Optionally, the interpolated pixels adjacent to the native pixels include horizontally adjacent, vertically adjacent, and diagonally adjacent.

[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 black ink layer 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 black ink layer, an upper primary color ink layer disposed above the fluid common electrode, an upper transparent hydrophobic layer disposed on the upper primary color ink layer, 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.

[0018] Optionally, the contraction positions of the upper primary color ink and the lower black ink are opposite, and the extension directions are opposite.

[0019] The beneficial effects of the present invention are as follows: when the present invention determines that the first image to be displayed is a low-resolution image, a display pixel group is obtained, the display pixel group includes native pixels and interpolation 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 interpolation 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 interpolation 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 the current display pixel group, the corresponding black ink aperture ratio will be smaller than the current display pixel group. Therefore, when the interpolation 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 interpolation pixel will be smaller than 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 the image resolution. Similarly, when the display grayscale value corresponding to the adjacent display pixel group is smaller than the current display pixel group, on the contrary, the actual grayscale value of the interpolation pixel can also 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. Compared with the prior art, the present invention does not require complex algorithm support, and only needs to be based on the structural characteristics of the electronic paper display itself to achieve image super-resolution and improve the display effect of the electronic paper display.

[0020] In summary, the present invention can achieve image super-resolution through the characteristics of the electronic paper display itself, improve display quality, reduce the image super-resolution processing flow, and save resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a method for optimizing the display of low-resolution images on a double-layer ink electronic paper display provided by 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 It 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 of a double-layer ink electronic paper display. Those skilled in the art can refer to the content of this article and appropriately improve the technical details for implementation. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously 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 has found through research that the prior art electronic paper display itself cannot convert low-resolution images into adaptive high-resolution images. Therefore, when the electronic paper display displays low-resolution images, the display effect is poor if it is not processed by the image super-resolution algorithm.

[0027] Therefore, the embodiment of the present invention provides a method for optimizing the display of low-resolution images of 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 larger 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 the 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 as to ensure a one-to-one correspondence.

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

[0032] In this specific embodiment, Figure 2As shown, the display pixel has 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 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. 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 the same display gray level values for multiple adjacent display pixels. For example, for 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 values. 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, 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 to the current display pixel group horizontally, vertically, and diagonally.

[0044] Step S4: Obtain a first upper driving voltage and a second lower driving voltage corresponding to the display gray level value according to the display gray level 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 level value presented by the interpolation pixel deflects towards the display gray level 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 may be some inaccuracies in the translation due to the lack of clear context for some terms like "所属", which is translated as "所属" here for lack of a more appropriate replacement. You may need to adjust it according to the actual situation.There are 4 display pixel groups, and the corresponding display grayscale values ​​are 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 for the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 110 forms an opening rate of 0.52 for the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.60 for the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 120 forms an opening rate of 0.54 for the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.55 for the black ink; the first upper layer driving voltage corresponding to the display grayscale value of 120 forms an opening rate of 0.54 for the primary color ink, and the second lower layer driving voltage forms an opening rate of 0.55 for 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 an interpolation is formed 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 only used as an example, and the specific parameters of 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 a color screen display.

[0050] When it is determined that the first image to be displayed is a low-resolution image, an embodiment of the present invention obtains a display pixel group, which includes 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 the current display pixel group, the corresponding black ink aperture ratio will be smaller than the current display pixel group. Therefore, when the interpolation 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 interpolation pixel will be smaller than 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 the image resolution. Similarly, when the display grayscale value corresponding to the adjacent display pixel group is smaller than the current display pixel group, on the contrary, the actual grayscale value of the interpolation pixel can also 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. Compared with the prior art, the embodiment of the present invention does not require complex algorithm support, and only needs to be based on the structural characteristics of the electronic paper display itself to achieve image super-resolution and improve the display effect of the electronic paper display.

[0051] In summary, the embodiments of the present invention can achieve image super-resolution through the characteristics of the electronic paper display itself, improve display quality, reduce the image super-resolution processing flow, and save resources.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope 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 level values 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 layer and a lower black ink layer respectively, and the upper primary color ink layer and the lower black ink layer are driven separately, and the ink aperture ratios of the upper primary color ink layer and the lower black ink layer jointly determine the gray level value of the corresponding display pixel. The larger the gray level value of the display pixel, the larger the ink aperture ratio of the upper primary color ink layer, and the smaller the ink aperture ratio of the lower black ink layer; Step S2: According to the display gray levels 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 level values, 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 an adjacent display pixel group; Step S4: According to the display gray level value corresponding to the display pixel group, obtaining a first upper driving voltage and a second lower driving voltage corresponding to the display gray level 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 level value presented by the interpolation pixels deflects towards the display gray level 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, determining whether the first image is a low-resolution image according to the display gray levels of the display screen signal in each display pixel of the electronic paper display includes: Determining whether the display gray level 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, 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 is a rectangular structure, including a lower white hydrophobic layer, a lower black ink is arranged above the lower white hydrophobic layer, a black driving electrode is arranged below the lower white hydrophobic layer, a fluid common electrode is arranged above the lower black ink, an upper primary color ink is arranged above the fluid common electrode, an upper transparent hydrophobic layer is arranged on the upper primary color ink, and a first primary color driving electrode is arranged 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, and 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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