Display system, display method, and display program

Abstract

This invention provides a display system, display method, and display program that make it easier to recognize objects in a display panel that displays an image using multiple color particles of different colors. [Solution] The electronic paper 100 includes an acquisition processing unit 211 that acquires color information of the background and objects contained in the input image corresponding to the input image data, a determination processing unit 212 that determines the border color that outlines the object based on the color information of the background and objects acquired by the acquisition processing unit 211 and the color information of the color particles, and a display processing unit 213 that displays the input image on the display panel 10 based on the border color determined by the determination processing unit 212.

Description

Technical Field

[0001] The present invention relates to a display device such as an electronic paper that displays an image by applying a voltage to a display panel on which color capsules containing color particles are arranged.

Background Art

[0002] Conventionally, electronic paper is known as a display panel that can be rewritten many times and has low power consumption. The electronic paper is a display panel that displays an image by applying a voltage to a display panel on which a plurality of color capsules containing a plurality of color particles of different colors are arranged and moving the color particles. In the electronic paper, for example, in an electro-optical display having a color gamut with a primary color palette, a technique for rendering a color image by descreening using a color error diffusion method is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the background color and the color of an object such as characters are similar in the input image, the boundary between the background and the object becomes ambiguous and it becomes difficult to recognize the object.

[0005] An object of the present disclosure is to provide a display system, a display method, and a display program capable of easily recognizing an object in a display panel that displays an image with a plurality of color particles of different colors. [[ID=,40]]

Means for Solving the Problems

[0006] A display system according to one aspect of the present disclosure is a system that displays an image by applying a voltage to a display panel on which a plurality of color capsules, each containing a plurality of color particles of different colors, are arranged, thereby moving the color particles. The display system comprises: an acquisition processing unit that acquires color information of the background and objects included in an input image corresponding to input image data; a determination processing unit that determines a border color for the objects based on the color information of the background and objects acquired by the acquisition processing unit and the color information of the color particles; and a display processing unit that displays the input image on the display panel based on the border color determined by the determination processing unit.

[0007] Another aspect of the present disclosure relates to a display method that displays an image by applying a voltage to a display panel on which a plurality of color capsules, each containing a plurality of color particles of different colors, are arranged, thereby moving the color particles. The display method involves one or more processors performing the following actions: acquiring color information of a background and objects contained in an input image corresponding to input image data; determining a border color for the objects based on the acquired color information of the background and objects and the color information of the color particles; and displaying the input image on the display panel based on the determined border color.

[0008] A display program according to another aspect of the present disclosure is a program that displays an image by applying a voltage to a display panel on which a plurality of color capsules, each containing a plurality of color particles of different colors, are arranged, thereby moving the color particles. The display program is a program that causes one or more processors to perform the following actions: acquire color information of the background and objects contained in an input image corresponding to input image data; determine a border color for the objects based on the acquired color information of the background and objects and the color information of the color particles; and display the input image on the display panel based on the determined border color. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a display system, a display method, and a display program that make it easier to recognize objects in a display panel that displays an image using multiple color particles of different colors. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic cross-sectional view showing the structure of an electronic paper according to an embodiment of this disclosure. [Figure 2] Figure 2 is a schematic enlarged view showing the structure around the microcapsule of the electronic paper according to the embodiment of this disclosure. [Figure 3] Figure 3 is a block diagram showing the configuration of an electronic paper according to an embodiment of this disclosure. [Figure 4] Figure 4 shows an example of an input image. [Figure 5] Figure 5 is a table that quantifies the lightness, saturation, and hue of each color particle. [Figure 6] Figure 6 is a flowchart showing an example of the steps for image display processing performed in the electronic paper according to the embodiment of this disclosure. [Figure 7] Figure 7 is a table that quantifies the brightness, saturation, and hue of the input image's colors. [Figure 8] Figure 8 is a diagram illustrating a method for determining the border color according to an embodiment of this disclosure. [Modes for carrying out the invention]

[0011] The embodiments of this disclosure will be described below with reference to the attached drawings. Note that the following embodiments are merely examples of the embodiments of this disclosure and do not limit the technical scope of this disclosure.

[0012] The display system described herein is a system that displays an image by applying a voltage to a display panel on which multiple color capsules, each containing multiple color particles of different colors, are arranged, thereby moving the color particles. In this embodiment, electronic paper is given as an example of the display system.

[0013] [Configuration of Electronic Paper 100] Referring to FIGS. 1 to 8, the electronic paper 100 according to an embodiment of the present disclosure will be described. FIG. 1 is a cross-sectional view schematically showing the structure of the electronic paper 100 according to an embodiment of the present disclosure.

[0014] As shown in FIG. 1, the electronic paper 100 functions as a display device for displaying images. The electronic paper 100 is used, for example, as an electronic shelf label, an electronic advertisement, an e-book terminal, or an electronic notebook. Note that the electronic paper 100 may be used as a device other than an electronic shelf label, an electronic advertisement, an e-book terminal, and an electronic notebook.

[0015] The electronic paper 100 includes a housing 1, a display panel 10, and a control device 20. The housing 1 houses the display panel 10 and the control device 20. The housing 1 has an opening 1a on the front surface.

[0016] The display panel 10 displays images. The display panel 10 is formed larger than the opening 1a of the housing 1 and is arranged to cover the opening 1a. Among the display panel 10, the area corresponding to the opening 1a is a display area where images are visually recognized by the user.

[0017] The display panel 10 further includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, a plurality of microcapsules 13 (an example of the color capsules of the present disclosure), a first electrode 14, and a second electrode 15.

[0018] The first substrate 11 is formed of a transparent plate member or sheet member such as glass or resin. A anti-reflection film may be formed on the outer surface (the side opposite to the second substrate 12) of the first substrate 11, or a water-repellent treatment may be performed. The second substrate 12 is formed of a plate member or sheet member such as glass or resin.

[0019] The microcapsules 13 are disposed between the first substrate 11 and the second substrate 12. The microcapsules 13 are, for example, laid in one layer between the first substrate 11 and the second substrate 12. The microcapsules 13 have a substantially spherical shape. The microcapsules 13 have a diameter of, for example, several tens of μm or more and several hundreds of μm or less.

[0020] FIG. 2 is an enlarged view schematically showing the structure around the microcapsules 13 of the electronic paper 100. As shown in FIG. 2, the microcapsules 13 have a film 131, a plurality of color particles 132, and a dispersion liquid 133. The film 131 is, for example, transparent. The film 131 is, for example, a transparent resin film. The material of the film 131 is not particularly limited, but is, for example, urethane resin, melanin resin, or rubber.

[0021] The color particles 132 are pigments. The color particles 132 constitute a part of the image displayed on the display panel 10. The color particles 132 move when a voltage is applied. In the present embodiment, moving includes moving and rotating. In the present embodiment, the color particles 132 are electrophoretic particles. Specifically, the color particles 132 move in the dispersion liquid 133 according to the voltage applied between the first electrode 14 and the second electrode 15. Thereby, a predetermined image is displayed on the display panel 10.

[0022] The color particles 132 are, for example, organic or inorganic particles. In the present embodiment, the color particles 132 have six-color particles, for example, white particles containing a white pigment, red particles containing a red pigment, blue particles containing a blue pigment, green particles containing a green pigment, yellow particles containing a yellow pigment, and black particles containing a black pigment. The white particles, red particles, blue particles, green particles, yellow particles, and black particles are an example of the color particles of the present disclosure. The color particles of the present disclosure are not limited to the above color particles. For example, the color particles 132 may be composed of four-color particles of white particles, red particles, blue particles, and yellow particles.

[0023] Figure 2 illustrates two color particles 132a and 132b of different colors for the sake of simplicity. Color particle 132a is, for example, negatively charged. On the other hand, color particle 132b is, for example, positively charged. In other words, color particles 132a and 132b are not only different in color but also charged with different polarities.

[0024] The dispersion 133 is, for example, transparent. The dispersion 133 is an insulating liquid. The dispersion 133 is not particularly limited, but may contain, for example, water, an alcohol-based solvent, esters, ketones, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, or oils. In this embodiment, the dispersion 133 contains, for example, an aliphatic hydrocarbon.

[0025] The first electrode 14 and the second electrode 15 are positioned opposite each other, with the microcapsule 13 in between.

[0026] The first electrode 14 is positioned, for example, on the outside (first substrate 11 side) relative to the microcapsule 13. The first electrode 14 may be formed, for example, on the first substrate 11. In this embodiment, the first electrode 14 is formed on the first substrate 11.

[0027] The first electrode 14 is formed of a light-transmitting conductive material. The first electrode 14 is not particularly limited, but for example, it is formed of ITO. In this embodiment, the first electrode 14 is a common electrode. The first electrode 14 is provided, for example, one for multiple (in this case, all) pixels. The first electrode 14 is, for example, grounded and has a ground potential.

[0028] The second electrode 15 is positioned, for example, on the inside (second substrate 12 side) relative to the microcapsule 13. The second electrode 15 may be formed, for example, on the second substrate 12. In this embodiment, the second electrode 15 is formed on the second substrate 12.

[0029] The second electrode 15 is not particularly limited, but is formed of a metallic material such as copper. In this embodiment, the second electrode 15 is a pixel electrode. The second electrode 15 is formed in a substantially rectangular shape in plan view, and multiple electrodes are provided. The multiple second electrodes 15 are arranged adjacent to each other with a predetermined gap between them.

[0030] For example, when a positive potential is applied to the second electrode 15a, the color particles 132a between the second electrode 15a and the first electrode 14 are attracted to the second electrode 15a. Also, the color particles 132b between the second electrode 15a and the first electrode 14 are attracted to the first electrode 14.

[0031] On the other hand, for example, if a negative potential is applied to the second electrode 15b, the color particles 132a between the second electrode 15b and the first electrode 14 are attracted to the first electrode 14. Also, the color particles 132b between the second electrode 15b and the first electrode 14 are attracted to the second electrode 15b.

[0032] In this way, the electronic paper 100 displays an image by controlling the voltage applied to the first electrode 14 and the second electrode 15 to move the color particles 132. In this embodiment, for example, white, red, blue, green, yellow, and black colors are displayed using white particles, red particles, blue particles, green particles, yellow particles, and black particles. However, the method of displaying the color is not limited to this, and well-known display methods can be applied.

[0033] As shown in Figure 1, the electronic paper 100 comprises a display panel 10 and a control device 20. The control device 20 controls various operations of the electronic paper 100. The control device 20 controls the display panel 10, causing the electronic paper 100 to display a predetermined image.

[0034] Next, the configuration of the electronic paper 100 will be described with reference to Figure 3. Figure 3 is a block diagram showing the configuration of the electronic paper 100.

[0035] As shown in Figure 3, the electronic paper 100 includes a communication unit 3 in addition to the display panel 10 and control device 20 described above. The electronic paper 100 may further include operation buttons that accept user input. The electronic paper 100 may also include a touch panel on the surface of the display panel 10 that accepts user input.

[0036] Communication unit 3 is, for example, an interface device for wireless communication. Communication unit 3 is, for example, a network interface controller. Communication unit 3 communicates with a personal computer, etc., via a communication network such as the Internet and a public telephone network. Communication unit 3 can receive instruction signals from an instruction terminal (not shown) of a personal computer, etc. Communication unit 3 may also be able to send and receive signals to and from an instruction terminal (not shown). Furthermore, communication unit 3 may be, for example, an interface device for wired communication.

[0037] The control device 20 includes a control unit 21 and a storage unit 22. The control unit 21 has a processor. The control unit 21 has, for example, a central processing unit (CPU). The control unit 21 may also have a general-purpose computing unit.

[0038] The storage unit 22 stores data and computer programs. The data includes, for example, image data relating to display images to be displayed on the display panel 10.

[0039] The storage unit 22 includes a main memory and an auxiliary storage device. The main memory is, for example, a semiconductor memory. The auxiliary storage device is, for example, a semiconductor memory and / or a hard disk drive. The storage unit 22 may also include removable media. The control unit 21 executes the computer program stored in the storage unit 22 to perform the image display processing (see Figure 6) described later.

[0040] The control unit 21 includes control devices such as a CPU, ROM, and RAM. The CPU is a processor that performs various arithmetic operations. The ROM pre-stores control programs such as a BIOS and OS for the CPU to perform various operations. The RAM stores various information and is used as a temporary storage memory (work area) for the various operations performed by the CPU. The control unit 21 controls the control device 20 by executing various control programs pre-stored in the ROM or storage unit 22 using the CPU.

[0041] Specifically, the control unit 21 includes various processing units such as an acquisition processing unit 211, a decision processing unit 212, and a display processing unit 213. The control unit 21 functions as these various processing units by executing various processes according to the control program using the CPU. Some or all of the processing units included in the control unit 21 may be composed of electronic circuits. The control program may be a program that causes multiple processors to function as these various processing units.

[0042] The acquisition processing unit 211 acquires color information of the background and characters (an example of an object in this disclosure) contained in the input image data corresponding to the input image data. The color information is a color parameter that quantifies the characteristics of a color. For example, the color parameter is a numerical representation of a color characteristic, such as "brightness (V)", "saturation (S)", and "hue (H)". The color parameter may be one type of parameter, multiple types of parameters, or a combination of multiple types of parameters. A color parameter that combines multiple types of parameters can be expressed, for example, as "a × V + b × S + c × H" (where a, b, and c are coefficients, V is brightness, S is saturation, and H is hue). The object in this disclosure is not limited to characters, but may also be a symbol, figure, image, etc. Furthermore, the color parameter in this disclosure only needs to include at least one of brightness, saturation, and hue.

[0043] Figure 4 shows an example of an input image P1. The acquisition processing unit 211 performs predetermined image processing (such as OCR processing) on ​​the input image P1 to extract the text and background. The acquisition processing unit 211 acquires the color information (brightness, saturation, hue) of the extracted background Pa and the color information (brightness, saturation, hue) of the extracted text Pb (an example of an object in this disclosure). For example, the acquisition processing unit 211 acquires color parameters that quantify brightness, saturation, and hue.

[0044] In conventional technology, when the background Pa and the character Pb are similar in color, the boundary between the background Pa and the character Pb becomes ambiguous, as shown in Figure 4, making it difficult to recognize the character Pb. In contrast, the electronic paper 100 according to this embodiment has a configuration that makes the character Pb easier to recognize, as shown below.

[0045] The determination processing unit 212 determines the border color surrounding the character Pb based on the color information of the background Pa and character Pb acquired by the acquisition processing unit 211 and the color information of the color particles 132. Specifically, the determination processing unit 212 determines the border color based on at least one of the following: the difference between the color parameters (brightness, saturation, hue) of the background Pa corresponding to the input image P1 and the color parameters (brightness, saturation, hue) of the color particles 132, and the difference between the color parameters (brightness, saturation, hue) of the character Pb corresponding to the input image P1 and the color parameters (brightness, saturation, hue) of the color particles 132.

[0046] Conceptually, the decision processing unit 212 determines the border color to be a color that is easy to distinguish between the background color Pa and the color of the characters Pb (a color with different color information, a color with a large difference in color parameter values). Specifically, the decision processing unit 212 can adopt one of the following methods: a method of determining the border color to be a color with a large difference in color parameter values ​​from the background Pa (first decision method); a method of determining the border color to be a color with a large difference in color parameter values ​​from the color parameter of the characters Pb (second decision method); or a method of determining the border color to be a color with a large difference in color parameter values ​​from both the background Pa and the color parameter of the characters Pb (third decision method).

[0047] Generally, the color parameters of color particles 132—lightness (V), saturation (S), and hue (H)—can be determined from the RGB values ​​using the following formula. Figure 5 shows the relationship between RGB values ​​and lightness (V), saturation (S), and hue (H) corresponding to each color particle. ·RGB24bit → Brightness (0≦V≦255) Brightness=max(R,G,B) RGB24bit → Saturation (0≦S≦1) Saturation=(max(R,G,B)-min(R,G,B) / max(R,G,B)) ·RGB24bit → Hue (0°≦H≦360°) • When R is at its maximum Hue=60×((GB) / max(R,G,B)-min(R,G,B)) • When G is at its maximum Hue=60×((BR) / max(R,G,B)-min(R,G,B))+120 When B is at its maximum Hue=60×((RG) / max(R,G,B)-min(R,G,B))+240 ·When R=G=B hue=0

[0048] Furthermore, the determination processing unit 212 determines the border color from among a plurality of color particles 132 of different colors, the color of which the difference value is equal to or greater than a preset threshold. In addition, if there are multiple color particles 132 of different colors whose difference value is equal to or greater than the threshold, the determination processing unit 212 determines the border color based on preset priority information. A specific example of the method for determining the border color will be described later.

[0049] The display processing unit 213 displays the input image P1 on the display panel 10 based on the border color determined by the decision processing unit 212. Specifically, the display processing unit 213 displays the input image P1 on the display panel 10 based on the border color determined by the decision processing unit 212 when the difference between the color information of the background Pa and the color information of the characters Pb is less than a predetermined difference, and displays the input image P1 on the display panel 10 without using the border color when the difference between the color information of the background Pa and the color information of the characters Pb is greater than or equal to the predetermined difference. Specific examples of the display method of the input image P1 will be described later.

[0050] Furthermore, a well-known method can be applied to move the color particles 132 to display an image. For example, the display processing unit 213 moves the color particles 132 within each microcapsule 13 by applying a predetermined voltage to each pixel between the first electrode 14 and the second electrode 15 to display a color image.

[0051] [Image display processing] The following describes an example of the image display processing procedure performed on the electronic paper 100, with reference to Figure 6.

[0052] This disclosure can be understood as a disclosure of an image display method (display method of this disclosure) that performs one or more steps included in the image display process. Furthermore, one or more steps included in the image display process described herein may be omitted or divided as appropriate. In addition, the execution order of each step in the image display process may differ to the extent that similar effects are produced. Furthermore, although this description uses the case in which the control unit 21 (one processor) of the control device 20 executes each step in the image display process as an example, in other embodiments, multiple processors may distribute and execute each step in the image display process.

[0053] <Step S1> In step S1, the control unit 21 acquires the input image P1. Here, it is assumed that the control unit 21 acquires the input image P1 shown in Figure 4, for example.

[0054] <Step S2> In step S2, the control unit 21 acquires the color information of the input image P1. Specifically, the control unit 21 performs predetermined image processing (such as OCR) on the input image P1 to extract the background Pa and the characters Pb, and acquires the color information of the extracted background Pa and characters Pb. For example, the control unit 21 acquires color parameters that quantify the brightness, saturation, and hue of the background Pa and characters Pb.

[0055] Figure 7 shows the color parameters of brightness, saturation, and hue of the background Pa and the characters Pb acquired by the control unit 21.

[0056] <Step S3> In step S3, the control unit 21 acquires color information of the color particles 132 within each microcapsule 13. Specifically, the control unit 21 acquires color parameters (see Figure 5) that quantify the lightness, saturation, and hue of the white, red, blue, green, yellow, and black particles, respectively. The order of steps S2 and S3 does not matter.

[0057] <Step S4> In step S4, the control unit 21 calculates the difference (difference value) between the color information (brightness, saturation, hue) of the background Pa and characters Pb of the input image P1 and the color information (brightness, saturation, hue) of the color particles 132, and compares this difference value with a preset threshold. For example, the brightness threshold is set to 128, the saturation threshold is set to 0.8, and the hue threshold is set to 60°.

[0058] Specifically, the control unit 21 determines whether the difference between the lightness, saturation, and hue of the background Pa and the characters Pb and the lightness, saturation, and hue of the white particles is greater than or equal to the threshold. The control unit 21 also determines whether the difference between the lightness, saturation, and hue of the background Pa and the characters Pb and the lightness, saturation, and hue of the red particles is greater than or equal to the threshold. The control unit 21 also determines whether the difference between the lightness, saturation, and hue of the background Pa and the characters Pb and the lightness, saturation, and hue of the blue particles is greater than or equal to the threshold. The control unit 21 also determines whether the difference between the lightness, saturation, and hue of the background Pa and the characters Pb and the lightness, saturation, and hue of the green particles is greater than or equal to the threshold. The control unit 21 also determines whether the difference between the lightness, saturation, and hue of the background Pa and the characters Pb and the lightness, saturation, and hue of the yellow particles is greater than or equal to the threshold. Furthermore, the control unit 21 determines whether the difference values ​​between the brightness, saturation, and hue of the background Pa and the characters Pb and the brightness, saturation, and hue of the black particles are greater than or equal to the threshold.

[0059] <Step S5> In step S5, the control unit 21 identifies a color whose difference value is greater than or equal to the threshold. Figure 8 shows the outline Pc of the character Pb in the input image P1 (the boundary between the background Pa and the character Pb), and candidate colors for the outline Pc (color particles 132) are white, red, blue, green, yellow, and black. For example, in Figure 8, white indicates that the saturation is greater than or equal to the threshold when compared with the colors of the background Pa and the character Pb, and yellow indicates that the hue is greater than or equal to the threshold when compared with the colors of the background Pa and the character Pb. Red, blue, green, and black all indicate that the saturation is less than the threshold when compared with the colors of the background Pa and the character Pb.

[0060] In the above example, the control unit 21 identifies white and yellow colors for which the difference value is equal to or greater than the threshold.

[0061] <Step S6> In step S6, the control unit 21 determines the color of the border portion Pc (border color). Specifically, the control unit 21 determines the border color to be the color of the color particle 132 whose difference value is equal to or greater than the threshold. Furthermore, if there are multiple color particles 132 of different colors whose difference value is equal to or greater than the threshold, the control unit 21 determines the border color based on pre-set priority information.

[0062] In the example shown in Figure 8, there are two colors (white and yellow) whose difference value is greater than or equal to the threshold, so the control unit 21 determines the border color based on the priority information. For example, the control unit 21 determines the border color based on the user's selection operation. For example, the control unit 21 determines white as the border color when the user selects white, and determines yellow as the border color when the user selects yellow.

[0063] In another embodiment, the control unit 21 may determine the border color based on the difference value of one of the multiple color parameters when there are multiple color particles whose difference value is greater than or equal to the threshold. Specifically, the control unit 21 determines the border color based on a preset difference value of lightness among lightness, saturation, and hue. For example, the control unit 21 determines the color with the largest difference value of lightness as the border color. The control unit 21 may also determine the color with the largest difference value of saturation as the border color, or the color with the largest difference value of hue as the border color. The user may choose which of lightness, saturation, and hue to prioritize (which to use for determination).

[0064] In another embodiment, the control unit 21 may determine the border color based on the color parameters of the background Pa and the characters Pb when there are multiple color particles whose difference value is greater than or equal to the threshold. Specifically, the control unit 21 determines which of the lightness, saturation, and hue to prioritize (be used for determination) based on the color of the input image P1 (lightness, saturation, and hue of the background Pa and characters Pb), and determines the color with the largest difference value of the determined color parameter (lightness, saturation, or hue) as the border color. The control unit 21 may pre-register the color to be determined (the color to prioritize) for each color of the background Pa and characters Pb.

[0065] In another embodiment, the control unit 21 may individually set the threshold for the background color Pa and the threshold for the color of the character Pb.

[0066] <Step S7> In step S7, the control unit 21 displays the input image P1 on the display panel 10 based on the determined border color. Specifically, the control unit 21 displays the background Pa and the characters Pb, and also displays the border portion Pc in the color (border color) determined in step S6.

[0067] If, in step S4, no color exists whose difference value is equal to or greater than the threshold, the control unit 21 displays the input image P1 on the display panel 10 as is without using the border color. In another embodiment, the control unit 21 may determine the color with the largest difference value as the border color and display the border portion Pc with the determined color.

[0068] Furthermore, the control unit 21 displays the input image P1 on the display panel 10 based on the determined border color, because the boundary between the background Pa and the character Pb becomes ambiguous when the difference between the color information of the background Pa and the color information of the character Pb is less than a predetermined difference. Conversely, the control unit 21 displays the input image P1 on the display panel 10 as is without using the border color, because the boundary between the background Pa and the character Pb is clear when the difference between the color information of the background Pa and the color information of the character Pb is greater than or equal to the predetermined difference.

[0069] The control unit 21 executes the image display process each time it acquires the input image P1. In the above example, a method (third determination method) is shown in which the color with the largest difference value between the background color Pa and the color of the characters Pb is determined as the border color. However, in other embodiments, the control unit 21 may adopt a method (first determination method) in which the color with the largest difference value between the background color Pa and the color of the characters Pb is determined as the border color, or a method (second determination method) in which the color with the largest difference value between the characters Pb and the color of the characters Pb is determined as the border color.

[0070] As described above, the electronic paper 100 according to this embodiment displays an image by applying a voltage to a display panel 10 on which a plurality of color capsules (microcapsules 13) containing a plurality of color particles 132 of different colors are arranged, thereby moving the color particles 132. The electronic paper 100 acquires the color information of the background Pa and character Pb (object) contained in the input image P1 corresponding to the input image data, and determines the border color that outlines the character Pb based on the acquired color information of the background Pa and character Pb and the color information of the color particles 132. Then, the electronic paper 100 displays the input image P1 on the display panel 10 based on the determined border color.

[0071] According to the above configuration, the border portion Pc can be displayed in a color that makes it easy to distinguish between the background color Pa and the color of the text Pb. Therefore, even if the colors of the background Pa and the text Pb are similar, the boundary between the background Pa and the text Pb becomes clearer, making it easier to recognize the text Pb.

[0072] In the embodiments described above, the display system of the present disclosure is configured with electronic paper 100, but the display system of the present disclosure may be configured with a control device 20 alone. That is, the display system may be configured to include an acquisition processing unit 211, a decision processing unit 212, and a display processing unit 213. Also, in the embodiments described above, the control device 20 is built into the housing 1 of the electronic paper 100 (see Figure 1), but in other embodiments, the control device 20 may be located outside the housing 1. For example, the control device 20 may be located outside the housing 1 and connected to the display panel 10 wirelessly via a communication network (such as the Internet).

[0073] The control unit 21 of the control device 20 controls the entire electronic paper 100. The control unit 21 realizes various functions by reading and executing various programs stored in the memory unit 22 (for example, storage or ROM). The control unit 21 may be realized by one or more control devices / arithmetic units (CPU (Central Processing Unit), SoC (System on a Chip)). The control unit 21 may also be composed of one or more control circuits (electronic circuits).

[0074] [Note on disclosure] The following is an overview of the disclosures extracted from the above-described embodiments. Note that each configuration and processing function described in the following notes can be selected and combined as desired.

[0075] <Note 1> A display system that displays an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, An acquisition processing unit that acquires color information of the background and objects contained in the input image corresponding to the input image data, A determination processing unit determines the border color that outlines the object based on the background and object color information acquired by the acquisition processing unit and the color information of the color particles, A display processing unit that displays the input image on the display panel based on the border color determined by the determination processing unit, A display system equipped with the following features.

[0076] <Note 2> The aforementioned color information is a color parameter that quantifies the characteristics of a color. The determination processing unit determines the border color based on at least one of the following: the difference between the color parameter of the background corresponding to the input image and the color parameter of the color particles, and the difference between the color parameter of the object corresponding to the input image and the color parameter of the color particles. The display system described in Appendix 1.

[0077] <Note 3> The aforementioned color parameter includes at least one of lightness, saturation, and hue. The display system described in Appendix 2.

[0078] <Note 4> The determination processing unit determines the color of the color particle whose difference value is greater than or equal to a preset threshold from among a plurality of color particles of different colors to be the border color. The display system described in Appendix 2 or 3.

[0079] <Note 5> The determination processing unit determines the border color based on pre-set priority information when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system described in Appendix 4.

[0080] <Note 6> The determination processing unit determines the border color based on the difference value of one of the multiple color parameters when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system described in Appendix 4.

[0081] <Note 7> The determination processing unit determines the border color based on the background and the color parameters of the object when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system described in Appendix 4.

[0082] <Note 8> The display processing unit displays the input image on the display panel based on the border color determined by the determination processing unit when the difference between the background color information and the object color information is less than a predetermined difference, and displays the input image on the display panel without using the border color when the difference between the background color information and the object color information is greater than or equal to the predetermined difference. The display system described in any of the appendices 1 to 7.

[0083] <Note 9> A display method for displaying an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, To obtain the color information of the background and objects contained in the input image corresponding to the input image data, Based on the acquired background and object color information and the color particle color information, the border color for outlining the object is determined. Based on the determined border color, the input image is displayed on the display panel. A display method executed by one or more processors.

[0084] <Note 10> A display program that displays an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, To obtain the color information of the background and objects contained in the input image corresponding to the input image data, Based on the acquired background and object color information and the color particle color information, the border color for outlining the object is determined. Based on the determined border color, the input image is displayed on the display panel. A display program for causing one or more processors to execute, or a non-temporary computer-readable recording medium on which the display program is recorded. [Explanation of symbols]

[0085] 100: Electronic paper 10: Display Panel 3: Communications Department 11: First board 12: Second board 13: Microcapsules 14: 1st electrode 15: 2nd electrode 132: Color particles 20: Control device 21: Control Unit 22: Storage section 211: Acquisition Processing Unit 212: Decision Processing Unit 213: Display Processing Unit P1: Input image Pa:Background Pb: character PC: Border part

Claims

1. A display system that displays an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, An acquisition processing unit that acquires color information of the background and objects contained in the input image corresponding to the input image data, A determination processing unit determines the border color that outlines the object based on the background and object color information acquired by the acquisition processing unit and the color information of the color particles, A display processing unit that displays the input image on the display panel based on the border color determined by the determination processing unit, A display system equipped with the following features.

2. The aforementioned color information is a color parameter that quantifies the characteristics of a color. The determination processing unit determines the border color based on at least one of the following: the difference between the color parameter of the background corresponding to the input image and the color parameter of the color particles, and the difference between the color parameter of the object corresponding to the input image and the color parameter of the color particles. The display system according to claim 1.

3. The aforementioned color parameter includes at least one of lightness, saturation, and hue. The display system according to claim 2.

4. The determination processing unit determines the color of the color particle whose difference value is greater than or equal to a preset threshold from among a plurality of color particles of different colors to be the border color. The display system according to claim 2.

5. The determination processing unit determines the border color based on pre-set priority information when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system according to claim 4.

6. The determination processing unit determines the border color based on the difference value of one of the multiple color parameters when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system according to claim 4.

7. The determination processing unit determines the border color based on the background and the color parameters of the object when there are multiple color particles of different colors whose difference value is equal to or greater than the threshold. The display system according to claim 4.

8. The display processing unit displays the input image on the display panel based on the border color determined by the determination processing unit when the difference between the background color information and the object color information is less than a predetermined difference, and displays the input image on the display panel without using the border color when the difference between the background color information and the object color information is greater than or equal to the predetermined difference. A display system according to any one of claims 1 to 7.

9. A display method for displaying an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, To obtain the color information of the background and objects contained in the input image corresponding to the input image data, Based on the acquired background and object color information and the color particle color information, the border color for outlining the object is determined. Based on the determined border color, the input image is displayed on the display panel. A display method executed by one or more processors.

10. A display program that displays an image by applying a voltage to a display panel in which multiple color capsules containing multiple color particles of different colors are arranged, thereby moving the color particles, To obtain the color information of the background and objects contained in the input image corresponding to the input image data, Based on the acquired background and object color information and the color particle color information, the border color for outlining the object is determined. Based on the determined border color, the input image is displayed on the display panel. A display program that is executed on one or more processors.

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