Display method and display device

Abstract

To provide a display method and a display device for displaying a document page and a thumbnail image to be easily viewed even when size of a display screen is not sufficient.SOLUTION: A display method comprises: a display step of displaying page images PG, which are images of pages constituting a document, and thumbnail images PS of the pages on a display 141; a first acceptance step of accepting a first operation instructing enlargement of the page images PG; and an enlargement step of, when the first operation is accepted, enlarging and displaying the page image PG displayed on a preview screen 200, and moving a display position of the thumbnail image PS in a first direction in a display area. In the enlargement step, the thumbnail image PS is enlarged more than that before execution of the enlargement step, a part of the thumbnail image PS is hidden, and the display of the preview screen 200 is updated.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a display method and a display device.

Background Art

[0002] Conventionally, a technique for displaying pages of a document on a display device such as a smartphone has been known. The display device described in Patent Document 1 displays an image of a page of an e-book or a digital photograph as a main image, and displays a thumbnail image as a search screen for searching for an image of each page. In the configuration of Patent Document 1, a first display screen and a second display screen are arranged on a display unit of the display device with a boundary therebetween, the thumbnail image is displayed on the first display screen, and the main image is displayed on the second display screen.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the display unit is small, since both the first display screen and the second display screen are small, both the main image and the thumbnail image become difficult to view.

Means for Solving the Problems

[0005] One aspect for solving the above problems is a display method for displaying a document by a display device having a display screen, the method including: a display step of displaying, in a display area arranged on the display screen, a page image that is an image of a page constituting the document and a thumbnail image of the page; a first reception step of receiving a first operation for instructing enlargement of the page image; and an enlargement step of, when the first operation is received, enlarging and displaying the page image displayed in the display area and moving the display position of the thumbnail image in a first direction in the display area. In the enlargement step, the thumbnail image is enlarged more than before the execution of the enlargement step, and a part of the thumbnail image is hidden, and the display of the display area is updated.

[0006] Another aspect for solving the above problems is a display device including: a display unit having a display screen; a display control unit that displays, in a display area arranged on the display screen, a page image that is an image of a page constituting a document and a thumbnail image of the page; and a reception unit that receives an operation. When the reception unit receives a first operation for instructing enlargement of the page image, the display control unit performs a display update process of enlarging and displaying the page image displayed in the display area. In the display update process, the display position of the thumbnail image is moved in a first direction in the display area, the thumbnail image is enlarged more than before the execution of the display update process, and a part of the thumbnail image is hidden.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

[0008] Hereinafter, this embodiment will be described with reference to the drawings.

[0009] The printing system 100 according to this embodiment will be described. FIG. 1 is a diagram showing an example of the configuration of the printing system 100 and the smartphone 1.

[0010] The printing system 100 includes a smartphone 1 and a printer 2. The smartphone 1 and the printer 2 are communicably connected by short-range wireless communication such as Bluetooth (registered trademark) or NFC (Near Field Communication), for example. Also, the smartphone 1 and the printer 2 are communicably connected by wireless communication such as Wi-Fi (registered trademark), for example. Wireless communication using Wi-Fi enables high-speed communication compared to short-range wireless communication such as NFC.

[0011] The smartphone 1 selects a printing target based on an operation by the user and transmits printing instruction information CM for instructing printing of the selected printing target. The smartphone 1 may directly transmit the printing instruction information CM to the printer 2, or may transmit it to the printer 2 via a server device or the like. The printer 2 prints the printing target on a printing medium such as printing paper based on the printing instruction information CM from the smartphone 1.

[0012] The smartphone 1 is communicably connected to a personal computer or a server device (not shown) via wireless communication such as Wi-Fi. The smartphone 1 acquires document information DC from the personal computer or the server device.

[0013] The smartphone 1 includes a control unit 11, a touch panel 14, and a communication interface 15. The control unit 11 controls each part of the smartphone 1. The touch panel 14 receives operations from the user and displays various images. The touch panel includes a display 141 such as an LCD (Liquid Crystal Display) and a touch sensor 142.

[0014] The display 141 displays various images according to instructions from the control unit 11. The touch sensor 142 is formed integrally with the display surface of the display 141 and receives touch operations from the user. The touch sensor 142 is composed of, for example, a capacitance-type sensor or a pressure-sensitive sensor. The touch operation is an operation of bringing an indicator such as the user's finger or a pen for touch input into contact with the surface of the display 141. When a touch operation is performed, the touch sensor 142 generates an operation signal including the contact position. The touch sensor 142 outputs the operation signal to the control unit 11. The touch sensor 142 may be configured to be able to detect a multi-touch operation in which a plurality of positions of the touch sensor 142 are touched simultaneously. The display 141 corresponds to an example of a "display screen". The touch sensor 142 can be referred to as an "input unit". The touch panel 14 corresponds to an example of a "display unit".

[0015] The modes of user operations on the touch sensor 142 include, in addition to the touch operation of bringing an indicator into contact with the surface of the display 141, for example, long touch operations, swipe operations, and pinch operations. A long touch operation is an operation of keeping an indicator in contact with the touch sensor 142 without separating it from the touch sensor 142 for a predetermined time or more while the indicator is in contact with the display 141. A swipe operation is also called a flick operation. A swipe operation is an operation of bringing an indicator into contact with the display 141 and moving it while maintaining the contact. A pinch operation is an operation of bringing a plurality of indicators into contact with the touch sensor 142 and changing the distance between the indicators while keeping the indicators in contact with the touch sensor 142. A touch operation with a contact time of a predetermined time or less for a location on the display 141 is also called a tap operation. The touch sensor 142 may be configured to discriminate these modes of operation and output an operation signal indicating the mode of operation to the control unit 11. Alternatively, the touch sensor 142 may be configured to generate an operation signal indicating the contact position at a preset sampling period. In this case, the control unit 11 may be configured to determine the mode of operation performed by the user based on the operation signal input from the touch sensor 142.

[0016] The communication interface 15 includes a wireless communication interface circuit including an antenna, an RF (Radio Frequency) circuit, an encoder, a decoder, and the like. The communication interface 15 communicates with the printer 2 by short-range wireless communication using Bluetooth or NFC according to an instruction from the control unit 11. The communication interface 15 communicates with a server device (not shown) and the printer 2 by wireless communication such as Wi-Fi. The smartphone 1 corresponds to an example of a "display device".

[0017] In this embodiment, the communication interface 15 communicates with the printer 2 by short-range wireless communication such as Bluetooth or NFC, but is not limited thereto. The communication interface 15 may perform other wireless communication such as Wi-Fi and communicate with the printer 2. The communication interface 15 may communicate with the printer 2 by wire in accordance with the Ethernet (registered trademark) standard or the like.

[0018] The control unit 11 is a controller including a processor 12 and a memory 13. The memory 13 is a storage device that non-volatilely stores programs and data executed by the processor 12. The memory 13 is composed of a magnetic storage device such as an HDD (Hard Disk Drive), a semiconductor storage device such as an SSD (Solid State Drive), a semiconductor memory element such as a flash ROM (Read Only Memory), or other types of non-volatile storage devices. The memory 13 may include a RAM (Random Access Memory) that constitutes a work area of the processor 12. The memory 13 stores data processed by the control unit 11 and programs executed by the processor 12.

[0019] As programs executed by the processor 12, the memory 13 stores an OS (Operating System) 131 and an APP (Application Program) 132. The OS 131 is a control program that realizes basic functions of the smartphone 1 and provides a platform for the APP 132. The OS 131 is, for example, an Android (registered trademark) OS, a Windows (registered trademark) OS, an iOS (registered trademark), but may be other OSs.

[0020] APP132 is a program that realizes specific functions of the smartphone 1. The APP132 of this embodiment has a function of displaying an image based on document data. When the smartphone 1 is powered on, it loads and executes the OS131 and transitions to a state where APP132 can be executed. The smartphone 1 activates APP132 according to user operations and the like. Here, the smartphone 1 may be configured to execute not only APP132 but also a plurality of application programs. That is, the memory 13 may be configured to store a plurality of application programs, but the description of these configurations is omitted.

[0021] The memory 13 stores a set value 135. The set value 135 includes reference values and set values that are referred to in the processes executed by the processor 12.

[0022] The processor 12 may be composed of a single processor or may be configured such that a plurality of processors function as the processor 12. The processor 12 executes the programs stored in the memory 13 to control each part of the smartphone 1.

[0023] In this embodiment, the processor 12 controls each part of the smartphone 1 by executing the OS131 and APP132, but the control unit 11 may be an ASIC (Application Specific Integrated Circuit). The ASIC may execute processing according to the implemented functions. The control unit 11 may be a signal processing circuit. The signal processing circuit may execute processing by performing signal processing.

[0024] The control unit 11 includes, as functional blocks, a display control unit 121 and a reception unit 122.

[0025] By executing APP132, the processor 12 functions as a display control unit 121 and a reception unit 122. By executing APP132, the processor 12 causes the memory 13 to function as a document information storage unit 133 and an image information storage unit 134.

[0026] The document information storage unit 133 stores document information DC. The document information DC is data having a document format such as the PDF (Portable Document Format) type or the JPEG (Joint Photographic Experts Group) format. The document information storage unit 133 stores at least one document information DC for one document. The document information DC includes various information regarding the page number, order, size, page shape, etc. of the pages constituting the document for one document. The document information storage unit 133 may be able to store a plurality of document information DCs. The smartphone 1 acquires, for example, the document information DC from a personal computer or a server device through the communication interface 15 and stores it in the document information storage unit 133.

[0027] The image information storage unit 134 stores various images and screens to be displayed on the display 141. The image information storage unit 134 stores a print image PP, a thumbnail image PS, and a button image BT. The print image PP constitutes the page image PG to be displayed on the display 141. That is, the smartphone 1 displays the page image PG based on the print image PP. Also, the thumbnail image PS and the button image BT constitute the preview screen 200. The button image BT is an image for operation for switching the display mode described later when the user performs a touch operation. The page image PG, the thumbnail image PS, and the button image BT will be further described with reference to FIG. 2.

[0028] The display control unit 121 controls the display 141 to display on the display 141 a screen including information about the operating state of the smartphone 1 and the execution of the APP 132. For example, the display control unit 121 generates display data for displaying the preview screen 200. The display control unit 121 outputs the display data to the display 141, thereby causing the preview screen 200 to be displayed on the display 141.

[0029] The preview screen 200 is a screen for the user to visually check the state of the printed matter that the smartphone 1 causes the printer 2 to print before printing. The preview screen 200 is displayed when the APP 132 is launched by the user's operation. Therefore, even when the user does not execute printing on the printer 2, the user can display the preview screen 200 for the purpose of viewing the document. Therefore, the preview screen 200 can be called a viewing screen for the purpose of viewing a document.

[0030] The display control unit 121 generates a page image PG, which will be described later, from the print image PP. The display control unit 121 generates the display data of the preview screen 200 based on the page image PG, the button image BT and the thumbnail image PS stored in the memory 13.

[0031] When the reception unit 122 receives the user's operation, the display control unit 121 switches the display state of the preview screen 200 corresponding to the operation. The display state of the preview screen 200 will be described with reference to FIGS. 2, 3, and 4.

[0032] The reception unit 122 receives operations on the smartphone 1 executed by the user. The reception unit 122 receives the operations executed by the user based on the operation signals input from the touch sensor 142. The reception unit 122 has at least the function of receiving touch operations. The reception unit 122 may have, for example, the function of identifying the long touch operation, swipe operation, pinch operation, etc. described above. The reception unit 122 specifies the content of the operation performed by the user based on the operation position on the display 141. For example, the reception unit 122 specifies an operation on the button image BT, an operation on the thumbnail image PS, etc.

[0033] FIG. 2 shows an example of the preview screen 200 displayed on the display 141, and is a screen diagram showing the preview screen 200 in the normal display mode. FIG. 2 shows the main body 10 of the smartphone 1. The display 141 is arranged on the front surface of the main body 10 of the smartphone 1. Almost the entire part of the front surface of the main body 10 that is exposed on the display 141 is the display area of the display 141.

[0034] The preview screen 200 includes a document display area 201 and a thumbnail display area 202. FIGS. 2, and FIGS. 3 and 4 described later show examples in which the preview screen 200 is displayed in the entire display area of the display 141, but the preview screen 200 may be displayed only in a part of the display area of the display 141. Also, the display area of the display 141 and the preview screen 200 may completely coincide.

[0035] The display state shown in FIG. 2 is called the normal display mode. In the normal display mode, the document display area 201 and the thumbnail display area 202 are arranged in the display area of the display 141 so as not to overlap each other. In FIG. 2, the document display area 201 is arranged at the upper part of the preview screen 200, and the thumbnail display area 202 is arranged at the lower part of the preview screen 200, but the positional relationship between the document display area 201 and the thumbnail display area 202 may be reversed.

[0036] In FIG. 2, there is a gap between the document display area 201 and the thumbnail display area 202, but this is a deformation for easy understanding of the figure. In the preview screen 200, the document display area 201 and the thumbnail display area 202 may be arranged without a gap.

[0037] In FIG. 2, and FIGS. 3 and 4 to be described later, the X-axis and the Y-axis are illustrated as the reference directions in the preview screen 200. The X-axis is an axis parallel to the horizontal direction of the preview screen 200. The Y-axis is orthogonal to the X-axis and is an axis parallel to the vertical direction of the preview screen 200. The X-axis corresponds to an example of the first axis, and the Y-axis corresponds to an example of the second axis.

[0038] Also, in the figure, directions R, L along the X-axis direction, and directions UP, and DW along the Y-axis are shown. Direction R corresponds to the right direction in the preview screen 200. Direction L corresponds to the left direction in the preview screen 200. Direction UP corresponds to the upward direction in the preview screen 200. Direction DW corresponds to the downward direction in the preview screen 200. In the following description, these directions are denoted as the right direction R, the left direction L, the upward direction UP, and the downward direction DW, and right, left, up, and down are defined based on these.

[0039] The page image PG is arranged in the document display area 201. The page image PG is an image of a page constituting the document and is an image generated from the printed image PP as described above. FIG. 2 shows an example in which two page images PG1, PG2 are displayed in the document display area 201. The page image PG1 and the page image PG2 are images of different pages. When these page images PG1, PG2 are not distinguished, they are described as the page image PG.

[0040] In the thumbnail display area 202, a thumbnail image group SG including thumbnail images PS of each page included in the document to be displayed is displayed. The thumbnail image group SG includes thumbnail images PS corresponding to at least a part of the pages included in the document to be displayed, and may include thumbnail images PS of all pages. In the thumbnail display area 202, the thumbnail image PS shows the content of the page of the document in an obliquely inclined state. At the center in the direction along the X-axis of the thumbnail display area 202, the thumbnail image PS is displayed enlarged to an extent that its content can be identified, and at both ends, a large number of thumbnail images PS are displayed in a state of overlapping.

[0041] When a plurality of thumbnail images PS are displayed in the thumbnail display area 202, each thumbnail image PS in the thumbnail display area 202 is displayed such that its upper end is at the same height position. In the example of FIG. 2, the upper ends of the respective thumbnail images PS are aligned with the upper end position TL. With this display mode, even when thumbnail images PS having different sizes and shapes are mixed among the thumbnail images PS displayed in the thumbnail display area 202, the visibility of the thumbnail images PS can be ensured.

[0042] The display control unit 121 moves the thumbnail image PS in the thumbnail display area 202 according to a user operation. For example, when the reception unit 122 receives a swipe operation to move the thumbnail image PS in the left direction L or the right direction R, the display control unit 121 moves the thumbnail image PS according to the direction of the swipe operation. Thereby, the user can move the thumbnail image PS of the desired page to the center of the thumbnail display area 202.

[0043] Also, although details will be described later, when the reception unit 122 receives an operation of selecting any one thumbnail image PS in the thumbnail display area 202, the display control unit 121 identifies the page corresponding to the touched thumbnail image PS. The display control unit 121 displays the page image PG of the identified page in the document display area 201. This operation is, for example, a touch operation on one thumbnail image PS. That is, in a state where the preview screen 200 is displayed, the user can select a document page while viewing the thumbnail image PS in the thumbnail display area 202, and the page image PG of the selected page is enlarged and displayed in the document display area 201.

[0044] In the normal display mode, the document display area 201 and the thumbnail display area 202 do not overlap. Therefore, the page image PG and the thumbnail image PS are displayed so as not to overlap each other. Also, both the page image PG and the thumbnail image PS are displayed so that the entire page can be viewed.

[0045] In the display example of FIG. 2, page images PG for two pages are displayed in the document display area 201. This display state is called the two-page display mode. The normal display mode may include a one-page display mode in addition to the two-page display mode. The one-page display mode is a display state in which the smartphone 1 displays only one page image PG in the document display area 201.

[0046] For example, in the one-page display mode, one page image PG is arranged at the center of the document display area 201.

[0047] In the normal display mode, the display control unit 121 adjusts the display size of the page image PG to match the size of the document display area 201. In a typical example, in both the horizontal and vertical directions, the size of the page image PG is less than or equal to the size of the document display area 201 in the horizontal direction, and the page image PG is displayed such that its size is maximized. Here, when the display control unit 121 enlarges or reduces the page image PG, it maintains the aspect ratio of the page image PG. Here, the size of the page image PG refers to the overall size of the page image PG displayed in the document display area 201. In the example of FIG. 2, the combined overall size of the page image PG1 and the page image PG2 corresponds to the size of the page image PG.

[0048] Therefore, when the page image PG is an image that is long in the vertical direction, i.e., a vertically long image, as shown in FIG. 2, the size of the page image PG in the vertical direction matches the size of the document display area 201. Margins of the document display area 201 are created on the right direction R side and the left direction L side of the page image PG. Also, for example, when the page image PG is an image that is long in the horizontal direction, i.e., a horizontally long image, the size of the page image PG in the horizontal direction matches the size of the document display area 201.

[0049] A button image BT is displayed on the preview screen 200. In the present embodiment, the button image BT includes a first button image BT1 and a second button image BT2.

[0050] The button image BT is a so-called floating button and is arranged without limitation inside the preview screen 200. For example, the display control unit 121 can arrange the button image BT at any position that overlaps the page image PG, overlaps the thumbnail image PS, or does not overlap these. Also, the display control unit 121 may move the display position of the button image BT according to the user's flick operation.

[0051] The first button image BT1 and the second button image BT2 are buttons for instructing switching of the display mode of the preview screen 200. The first button image BT1 is a button for instructing switching between the normal display mode shown in FIG. 2 and the main magnification mode shown in FIG. 3. The second button image BT2 is a button for instructing transition to the thumbnail center mode shown in FIG. 4 and return from the thumbnail center mode to the original display state.

[0052] When the first button image BT1 is touch-operated in the normal display mode of FIG. 2, the display control unit 121 switches the display state of the preview screen 200 to the main magnification mode of FIG. 3. Also, when the second button image BT2 is touch-operated in the normal display mode of FIG. 2, the display control unit 121 switches the display state of the preview screen 200 to the thumbnail center mode of FIG. 4. The first button image BT1 corresponds to an example of a "button". The operation of the first button image BT1 in the normal display mode corresponds to an example of a "first operation".

[0053] FIG. 3 is a screen diagram showing an example of the preview screen 200 in the main magnification mode. The main magnification mode is a display state in which the document display area 201 is displayed larger than in the normal display mode. In the example shown in FIG. 3, the document display area 201 is enlarged to a size that coincides with the preview screen 200. In the main magnification mode, the page image PG is displayed larger than in the normal display mode in accordance with the size of the document display area 201.

[0054] FIG. 3 shows an example in which two page images PG1 and PG2 are displayed in the document display area 201, but this is just an example. When the display control unit 121 switches the display state from a state in which one page image PG corresponding to one page is displayed in the normal display mode to the main magnification mode, one page image PG is displayed in the main magnification mode.

[0055] The position of the thumbnail display area 202 in the main magnification mode of FIG. 3 is the lower end portion of the preview screen 200, similar to the example shown in FIG. 2.

[0056] In the main magnification mode, the thumbnail display area 202 is arranged so as to overlap the document display area 201. Therefore, the thumbnail image PS is displayed overlapping the page image PG. The thumbnail image PS is displayed above the page image PG so that the user can visually recognize the thumbnail image PS. In this state, in order to ensure the visibility of the page image PG, the vertical size of the thumbnail display area 202 in the main magnification mode is smaller than the vertical size of the entire thumbnail image PS. For this reason, only a part of the thumbnail image PS is displayed in the thumbnail display area 202.

[0057] Headings, page numbers, etc. may be arranged at the top of the page of the document. For example, the page top image PT shown by the broken line in FIG. 3 often includes characters and figures of the headings in the thumbnail image PS. For this reason, when only the upper part of the thumbnail image PS is displayed in the thumbnail display area 202, the user can visually recognize headings and the like arranged at the upper part of the thumbnail image PS. On the other hand, in a state where only the lower part of the thumbnail image PS is displayed in the thumbnail display area 202, the user can obtain less information from the thumbnail image PS. For this reason, in the main magnification mode, the upper part of the thumbnail image PS is displayed in the thumbnail display area 202. As a result, the lower part of the thumbnail image PS becomes non-displayed as if it is outside the display area of the display 141.

[0058] In the main magnification mode illustrated in FIG. 3, the document display area 201 and the thumbnail display area 202 overlap in the vertical direction. That is, the thumbnail display area 202 is arranged below the document display area 201. In this display state, by reducing the vertical size of the thumbnail display area 202, a display can be realized in which the thumbnail image PS does not interfere with the visibility of the page image PG. The vertical size of the thumbnail display area 202 is smaller than that in the normal display mode. For this reason, compared with the normal display mode, it means that the thumbnail display area 202 has moved in the downward direction DW. Here, the downward direction DW corresponds to an example of the "first direction".

[0059] In a general document, there is often a margin at the bottom of the page. In FIG. 3, the bottom ends of the characters and images included in the page images PG1 and PG2 are indicated by a dashed line as the bottom position MC. Below the bottom position MC is the margin of the page images PG1 and PG2. By setting the upper end position TL of the thumbnail image PS to the same position as the bottom position MC or below the bottom position MC, the thumbnail image PS can be displayed so as not to interfere with the visibility of the main text of the page image PG.

[0060] Furthermore, in the main magnification mode, the thumbnail image PS is displayed in a larger size than in the normal display mode. The thumbnail image PS is, for example, displayed larger in the horizontal direction than in the normal display mode. The thumbnail image PS may be displayed larger in the vertical direction than in the normal display mode. As a result, the number of thumbnail images PS displayed in the thumbnail display area 202 may be less than in the normal display mode. By enlarging the thumbnail image PS, the visibility of the thumbnail image PS is enhanced compared to the normal display mode. Therefore, it is possible to compensate for the decrease in visibility caused by displaying only a part of the thumbnail image PS in the main magnification mode, and the user can know the content of the page from the thumbnail image PS.

[0061] When transitioning from the normal display mode to the main magnification mode, it is desirable that the magnification rate for enlarging the thumbnail image PS be determined based on the shape of the page of the document, that is, the shape of the thumbnail image PS. Specifically, the shape of the page is the aspect ratio of the page, which is the ratio of the length in the horizontal direction of the page to the length of the page in the vertical direction. The shape of the page may be portrait or landscape. The display control unit 121 may identify the standard size and orientation of the page. For example, the display control unit 121 identifies that the page is in the portrait orientation with the standard size of A6.

[0062] Also, there are two ways to handle the case where the display control unit 121 encounters pages of different shapes mixed in the document to be displayed. As a first method, the display control unit 121 identifies the shape of the page located at the beginning of the document, and sets the shape of the identified page as the shape of the page of the document to be displayed. The document to be displayed has a configuration in which a plurality of pages are arranged in order. According to the first method, by identifying the shape of the first page, the display control unit 121 can identify the shape of the page of the document to be displayed without determining the shape of the pages after the second page.

[0063] As a second method, the display control unit 121 may identify the shapes of all the pages of the document to be displayed, and set the shape corresponding to the most pages as the shape of the page of the document to be displayed. According to the second method, processing is performed in accordance with the shapes of a large number of pages among the pages included in the document to be displayed. In other words, processing is performed in accordance with the shape that occupies a large proportion in the document to be displayed.

[0064] In the present embodiment, the thumbnail images PS are displayed side by side in the horizontal direction in the thumbnail display area 202. For this reason, when the shape of the page is specified as portrait by the first method, the second method, or any other method, the display control unit 121 sets the magnification of the thumbnail image PS to the first magnification. On the other hand, when the shape of the page is specified as landscape, the display control unit 121 sets the magnification of the thumbnail image PS to a second magnification smaller than the first magnification. The case where the shape of the page is portrait means that the size in the horizontal direction of the page is smaller than the size in the vertical direction. The case where the shape of the page is landscape means that the size in the horizontal direction of the page is larger than the size in the vertical direction. As illustrated in FIGS. 2 to 4, when the thumbnail images PS are three-dimensionally displayed so as to be inclined diagonally, so-called Z-fighting occurs when the shape of the page is landscape, and inappropriate diving may be seen in the overlapping display of adjacent thumbnail images PS. By making the second magnification smaller than the first magnification, the occurrence of Z-fighting can be suppressed.

[0065] When the display state of the preview screen 200 switches from the normal display mode to the main magnification mode, the display sizes and display positions of the page image PG and the thumbnail image PS change. For this reason, the display control unit 121 may gradually switch the display sizes and display positions of the page image PG and the thumbnail image PS during the process of switching the display state from the normal display mode to the main magnification mode. Further, the display control unit 121 may perform an animation display in which the intermediate state between the normal display mode and the main magnification mode changes smoothly during the process of switching the display state from the normal display mode to the main magnification mode.

[0066] Even in the main magnification mode, the button image BT is arranged on the preview screen 200. The functions of the first button image BT1 and the second button image BT2 are as described above. When the first button image BT1 is touch-operated in the main magnification mode, the display state of the preview screen 200 is switched to the normal display mode. Also, when the second button image BT2 is touch-operated in the main magnification mode, the display state of the preview screen 200 is switched to the thumbnail center mode shown in FIG. 4.

[0067] Also, in the main magnification mode, as shown by reference numeral OP1 in FIG. 3, when a swipe operation or a flick operation is performed to move upward UP from a position overlapping the thumbnail image PS, the display state is switched to the thumbnail center mode. The operation OP1, that is, the above-described swipe operation or flick operation corresponds to an example of the "second operation".

[0068] When the display state is switched from the main magnification mode to the normal display mode, the thumbnail display area 202 moves upward UP, and the thumbnail image PS is reduced. When the display state is switched from the main magnification mode to the thumbnail center mode, as will be described later, the thumbnail display area 202 moves upward UP, and the thumbnail image PS is enlarged.

[0069] FIG. 4 is a screen diagram showing an example of the preview screen 200 in the thumbnail center mode. The thumbnail center mode is a display state in which the thumbnail image PS is displayed at or near the center of the preview screen 200. In the thumbnail center mode, similar to the main magnification mode, the document display area 201 is arranged in almost the entire preview screen 200, and the thumbnail display area 202 is arranged overlapping the document display area 201. The thumbnail center mode corresponds to a display state in which the thumbnail display area 202 is moved upward (UP) from the main magnification mode. Here, the upward direction (UP) corresponds to an example of the "second direction".

[0070] In the thumbnail center mode, the thumbnail display area 202 is larger than in the normal display mode and the main magnification mode. Correspondingly, the display size of the thumbnail image PS is larger than in the normal display mode and the main magnification mode, and the entire thumbnail image PS is displayed in the thumbnail display area 202. In the thumbnail center mode, by enlarging the thumbnail image PS and displaying it at the center of the preview screen 200, the user can visually recognize the details of the content of the thumbnail image PS.

[0071] As described above, the number of thumbnail images PS displayed in the thumbnail display area 202 in the main magnification mode may be less than in the normal display mode. Also, the number of thumbnail images PS displayed in the thumbnail display area 202 in the thumbnail center mode may be less than in the normal display mode and the main magnification mode.

[0072] In the thumbnail center mode, as shown by reference numeral OP2 in FIG. 4, when a swipe operation or a flick operation is performed to move downward (DW) from a position overlapping the thumbnail image PS on the preview screen 200, the display state is switched to the main magnification mode. The operation OP2, that is, the above-described swipe operation or flick operation, corresponds to an example of the "third operation". The downward direction (DW) corresponds to an example of the "first direction".

[0073] Even in the thumbnail center mode, button images BT are arranged on the preview screen 200. The functions of the first button image BT1 and the second button image BT2 are as described above. When the first button image BT1 is touched in the thumbnail center mode, the display state of the preview screen 200 is switched to the normal display mode. Also, when the second button image BT2 is touched in the thumbnail center mode, the display state of the preview screen 200 is switched to the main magnification mode.

[0074] When the display state is switched from the thumbnail center mode to the main magnification mode, the thumbnail display area 202 moves downward DW, and the thumbnail image PS is reduced. When the display state is switched from the thumbnail center mode to the normal display mode, the thumbnail display area 202 moves downward DW, and the thumbnail image PS is reduced.

[0075] Figures 5, 6, and 7 are flowcharts showing the processing of the control unit 11 of the smartphone 1. In these figures, it starts when the control unit 11 loads the APP132 and starts it according to the user's operation. Although not shown in the figures, when the execution of the APP132 ends and when the power of the smartphone 1 is switched off, the operations in Figures 5 - 7 end.

[0076] In step S1, the control unit 11 displays the preview screen 200 in the normal display mode. The page displayed in the document display area 201 at the start of the display in step S1 is the first page of the document to be displayed or the page that was displayed when the APP132 was executed immediately before.

[0077] In step S2, the control unit 11 determines whether the reception unit 122 has received an operation of selecting any one of the thumbnail images PS displayed in the thumbnail display area 202. The operation of selecting the thumbnail image PS is, for example, a touch operation or a tap operation at a position overlapping the display position of the thumbnail image PS.

[0078] When an operation of selecting the thumbnail image PS is received (step S2; YES), the control unit 11 proceeds to step S3. In step S3, the control unit 11 identifies the page image PG corresponding to the thumbnail image PS selected by the user's operation. In step S4, the control unit 11 causes the display control unit 121 to display the page image PG identified in step S3 on the preview screen 200. Then, the control unit 11 returns to step S2.

[0079] When an operation of selecting the thumbnail image PS has not been received (step S2; NO), the control unit 11 proceeds to step S5. In step S5, the control unit 11 determines whether the reception unit 122 has received an operation on the first button image BT1.

[0080] When an operation on the first button image BT1 is received (step S5; YES), the control unit 11 proceeds to step S6. In step S6, the control unit 11 identifies the shape of the pages included in the document to be displayed. In step S7, the control unit 11 determines the magnification corresponding to the shape of the page identified in step S6. For example, the control unit 11 determines the first magnification or the second magnification described above. In step S8, the control unit 11 switches the display state of the preview screen 200 to the main magnification mode according to the magnification determined in step S7. Then, the control unit 11 proceeds to step S21 (FIG. 6) described later.

[0081] When the operation on the first button image BT1 is not received (step S5; NO), the control unit 11 proceeds to step S9. In step S9, the control unit 11 determines whether the operation on the second button image BT2 has been received by the reception unit 122.

[0082] When the operation on the second button image BT2 is received (step S9; YES), the control unit 11 proceeds to step S11 described later. When the operation on the second button image BT2 is not received (step S9; NO), the control unit 11 proceeds to step S10. In step S10, the control unit 11 determines whether the flick operation in the upward direction UP has been received by the reception unit 122. The flick operation in the upward direction UP is, for example, the operation OP1. When the flick operation in the upward direction UP is not received (step S10; NO), the control unit 11 returns to step S2. When the flick operation in the upward direction UP is received (step S10; YES), the control unit 11 proceeds to step S11.

[0083] In step S11, the control unit 11 switches the display state of the preview screen 200 to the thumbnail center mode by the display control unit 121. Then, the control unit 11 proceeds to step S31 (FIG. 7).

[0084] In step S21, the control unit 11 determines whether an operation of selecting any one of the thumbnail images PS displayed in the thumbnail display area 202 has been received by the reception unit 122.

[0085] When an operation of selecting a thumbnail image PS is received (step S21; YES), the control unit 11 proceeds to step S22. In step S22, the control unit 11 identifies the page image PG corresponding to the thumbnail image PS selected by the user's operation. In step S23, the control unit 11 displays the page image PG identified in step S22 on the preview screen 200 in the normal display mode. Here, the display state of the preview screen 200 can be switched to the normal display mode. Then, the control unit 11 returns to step S2.

[0086] When an operation of selecting a thumbnail image PS has not been received (step S21; NO), the control unit 11 proceeds to step S24. In step S24, the control unit 11 determines whether an operation on the first button image BT1 has been received by the reception unit 122.

[0087] When an operation on the first button image BT1 has been received (step S24; YES), the control unit 11 proceeds to step S25. In step S25, the control unit 11 switches the display state of the preview screen 200 to the normal display mode. Then, the control unit 11 returns to step S2.

[0088] When an operation on the first button image BT1 has not been received (step S24; NO), the control unit 11 proceeds to step S26. In step S26, the control unit 11 determines whether an operation on the second button image BT2 has been received by the reception unit 122.

[0089] When an operation on the second button image BT2 has been received (step S26; YES), the control unit 11 proceeds to step S28, which will be described later. When the operation on the second button image BT2 is not received (step S26; NO), the control unit 11 proceeds to step S27. In step S27, the control unit 11 determines whether the flick operation in the upward direction UP is received by the reception unit 122. When the flick operation in the upward direction UP is not received (step S27; NO), the control unit 11 returns to step S21. When the flick operation in the upward direction UP is received (step S27; YES), the control unit 11 proceeds to step S28.

[0090] In step S28, the control unit 11 causes the display control unit 121 to switch the display state of the preview screen 200 to the thumbnail center mode. Then, the control unit 11 proceeds to step S31 (FIG. 7).

[0091] In step S31, the control unit 11 determines whether the reception unit 122 has received an operation of selecting any of the thumbnail images PS displayed in the thumbnail display area 202. When the operation of selecting the thumbnail image PS is received (step S31; YES), the control unit 11 proceeds to step S32. In step S32, the control unit 11 identifies the page image PG corresponding to the thumbnail image PS selected by the user's operation. In step S33, the control unit 11 displays the page image PG identified in step S32 on the preview screen 200 in the normal display mode. Here, the display state of the preview screen 200 is switched to the normal display mode. Then, the control unit 11 returns to step S2.

[0092] When the operation of selecting the thumbnail image PS is not received (step S31; NO), the control unit 11 proceeds to step S34. In step S34, the control unit 11 determines whether the reception unit 122 has received an operation on the first button image BT1.

[0093] When an operation on the first button image BT1 is received (step S34; YES), the control unit 11 proceeds to step S35. In step S35, the control unit 11 switches the display state of the preview screen 200 to the normal display mode. Thereafter, the control unit 11 returns to step S2.

[0094] When an operation on the first button image BT1 is not received (step S34; NO), the control unit 11 proceeds to step S36. In step S36, the control unit 11 determines whether an operation on the second button image BT2 has been received by the reception unit 122.

[0095] When an operation on the second button image BT2 is received (step S36; YES), the control unit 11 proceeds to step S38, which will be described later. When an operation on the second button image BT2 is not received (step S36; NO), the control unit 11 proceeds to step S37. In step S37, the control unit 11 determines whether a flick operation in the downward direction DW has been received by the reception unit 122. The flick operation in the downward direction DW is the operation OP2 shown in FIG. 4. When a flick operation in the downward direction DW is not received (step S37; NO), the control unit 11 returns to step S31. When a flick operation in the upward direction UP is received (step S37; YES), the control unit 11 proceeds to step S38.

[0096] In step S38, the control unit 11 switches, by means of the display control unit 121, the display state of the preview screen 200 to the display state before shifting to the thumbnail center mode. Here, when the display state is switched to the normal display mode, the control unit 11 proceeds to step S2. Also, in step S38, when the display state is switched to the main enlargement mode, the control unit 11 proceeds to step S21.

[0097] In the operation of this embodiment, step S1 corresponds to an example of a "display step". Step S5 corresponds to an example of a "first reception step". Step S8 corresponds to an example of a "magnification step". Steps S9, S10, S26, and S27 correspond to an example of a "second reception step". Steps S11 and S28 correspond to an example of a "movement step". Steps S36 and S37 correspond to an example of a "third reception step". Step S38 corresponds to an example of a "re-movement step".

[0098] In this embodiment, the thumbnail display area 202 in the normal display mode may be arranged at the upper part of the preview screen 200. In this case, in the main magnification mode, the thumbnail display area 202 may be arranged to overlap with the upper part of the document display area 201. For example, the thumbnail display area 202 may be arranged at the upper end of the preview screen 200. Also in this case, it is preferable that the upper part of the thumbnail image PS is displayed in the thumbnail display area 202 and the lower part of the thumbnail image PS is not displayed. In this case, as the "second operation", when a flick operation or a swipe operation is performed from a position overlapping the thumbnail image PS downward in the DW direction, the display control unit 121 may switch the display state to the thumbnail center mode. That is, contrary to the above embodiment, the upward UP corresponds to an example of the "first direction", and the downward DW corresponds to an example of the "second direction".

[0099] As described above, the display method according to the embodiment is a display method for causing the smartphone 1 having the display 141 to display a document. This display method includes a display step of displaying, on the preview screen 200 disposed on the display 141, a page image PG which is an image of a page constituting the document and a thumbnail image PS of the page. This display method includes a first reception step of receiving a first operation for instructing an enlargement of the page image PG. Further, when the first operation is received, the display method includes an enlargement step of enlarging and displaying the page image PG displayed on the preview screen 200 and moving the display position of the thumbnail image PS in a first direction on the preview screen 200. In the enlargement step, this display method enlarges the thumbnail image PS more than before the execution of the enlargement step, causes a part of the thumbnail image PS to be hidden, and updates the display of the preview screen 200.

[0100] The smartphone 1 that executes the above display method includes a touch panel 14 having a display 141. The smartphone 1 includes a display control unit 121 that displays, on the preview screen 200 disposed on the display 141, a page image PG which is an image of a page constituting the document and a thumbnail image PS of the page, and a reception unit 122 that receives an operation. When the reception unit 122 receives a first operation for instructing an enlargement of the page image PG, the display control unit 121 performs a display update process of enlarging and displaying the page image PG displayed on the preview screen 200. In the display update process, the display control unit 121 moves the display position of the thumbnail image PS in a first direction on the preview screen 200. The display control unit 121 enlarges the thumbnail image PS more than before the execution of the display update process and causes a part of the thumbnail image PS to be hidden.

[0101] According to the above display method and the smartphone 1 that executes the above display method, when displaying the preview screen 200, the page image PG is enlarged and displayed according to the operation. Here, the thumbnail image PS is enlarged so that a part of the thumbnail image PS is hidden. Thereby, even when the display 141 is not large enough to display the page image PG and the thumbnail image PS, the page image PG and at least a part of the thumbnail image PS can be displayed clearly.

[0102] In the above display method, in the display step, a thumbnail image group SG including thumbnail images PS of a plurality of pages is displayed on the preview screen 200. In the above display method, in the enlargement step, the display position of the thumbnail image group SG is moved in the first direction on the preview screen 200. Further, the thumbnail image group SG is enlarged more than before the execution of the enlargement step, and at least a part of the thumbnail images PS included in the thumbnail image group SG is made in a state where a part thereof is hidden. Thereby, when enlarging the page image PG, the thumbnail image group SG is moved and a part of the thumbnail image group SG is hidden, so that even when the thumbnail image PS overlaps the page image PG, the visibility of the page image PG can be ensured. That is, it is possible to adopt a display mode in which the thumbnail image PS overlaps the page image PG. Thereby, even when the size of the display 141 is small, the page image PG can be displayed clearly. Also, at least a part of the thumbnail image PS can be displayed clearly.

[0103] In the above display method, in the enlargement step, the enlargement ratio for enlarging the thumbnail image group SG more than before the execution of the enlargement step is determined according to the shape of the pages included in the document. Thereby, the enlargement ratio when enlarging the thumbnail image PS can be determined according to the shape of the page. For example, in the case of arranging and displaying a plurality of thumbnail images PS, when the thumbnail images PS are in an obliquely inclined shape and a three-dimensional display mode, Z-fighting can be suppressed. Thereby, the thumbnail image PS can be displayed more clearly on the display 141 with a limited size.

[0104] The above display method determines the shape of the pages included in a document based on whether the shape of the page located at the head among the pages constituting the document is portrait or landscape. Thereby, the shape of the pages included in the document can be easily specified.

[0105] The above display method determines the shape of the pages included in a document based on whether the ratio of portrait pages among the pages constituting the document is equal to or greater than a determination criterion or less than the determination criterion. Thereby, the shape of the pages included in the document can be specified more accurately.

[0106] In the above display method, the thumbnail image group SG includes a plurality of thumbnail images PS having the same shape as the pages. The thumbnail images PS are displayed such that the height positions of the upper ends of the plurality of thumbnail images PS are aligned in the height direction of the display 141. Thereby, when the thumbnail image group SG is moved upward UP or downward DW, the display states of the thumbnail images PS can be aligned. Also, since the upper ends of the respective thumbnail images PS are aligned, by displaying the upper parts of the thumbnail images PS so as not to be hidden, a state where the upper parts of the plurality of thumbnail images PS are easy to view can be realized.

[0107] The above display method, in the display step, causes operation buttons to be displayed on the preview screen 200, and in the first reception step, receives a first operation when the first button image BT1 is operated. Thereby, the user can switch the display state by performing a simple operation.

[0108] The above display method, in the enlargement step, executes a process of gradually enlarging the display size of the page image PG displayed on the preview screen 200. Thereby, the change in the display size of the page image PG can be clearly shown to the user.

[0109] The above display method includes a second reception step of receiving a second operation for instructing movement in a second direction opposite to the first direction with respect to the thumbnail image PS moved in the first direction in the enlargement step. Further, when the second operation is received, it includes a movement step of moving the thumbnail image PS to a position overlapping the page image PG. Thereby, by moving the display position of the thumbnail image PS according to the user's operation, the display state with high visibility of the thumbnail image PS can be switched.

[0110] The above display method enlarges the thumbnail image PS in the movement step compared to before the execution of the movement step. Thereby, the visibility of the thumbnail image PS can be further enhanced.

[0111] The above display method includes a third reception step of receiving a third operation for instructing movement in the first direction with respect to the thumbnail image PS moved in the second direction in the movement step. Further, when the third operation is received, it includes a re-movement step of moving the thumbnail image PS to the display position before the execution of the movement step. Thereby, it can easily return from the display state where the thumbnail image PS is moved to the original display state.

[0112] This embodiment shows one aspect and can be arbitrarily deformed and applied within the scope not departing from the gist.

[0113] In this embodiment, the case where the "display device" is the smartphone 1 will be described, but it is not limited thereto. The "display device" only needs to include a processor 12, a memory 13, and a touch panel 14. The "display device" may be configured as a tablet terminal.

[0114] In this embodiment, as an example of the normal display mode of the preview screen 200, a two-page display mode including two page images PG is shown, but three or more page images PG may be arranged side by side in the normal display mode. For example, three page images PG may be arranged side by side in the horizontal direction.

[0115] The shape of the button image BT shown in this embodiment, and the shapes of the document display area 201 and the thumbnail display area 202 can be changed as appropriate. For example, the button image BT may be rectangular or elliptical. The document display area 201 and the thumbnail display area 202 may have a vertically long, portrait shape.

[0116] In this embodiment, an example where the preview screen 200 is displayed across the entire display 141 is shown, but the present invention is not limited to this. The display 141 may be configured such that the preview screen 200 and a screen displayed by another application program are arranged side by side. Further, the preview screen 200 may be arranged in a part of the home screen displayed by the OS 131.

[0117] This embodiment will describe a display method realized by the processor 12 included in the smartphone 1 executing the OS 131 and the APP 132 stored in the memory 13, but this is just an example. It is also possible to configure it in the form of a recording medium on which a program executed by the processor 12 to realize this display method is recorded in a computer-readable manner, or a transmission medium that transmits this program. Here, as the recording medium, a magnetic, optical recording medium, or a semiconductor memory device can be used. Examples of the recording medium include portable or fixed recording media such as flexible disks, HDDs, CD-ROMs (Compact Disk Read Only Memories), DVDs (Digital Versatile Disks), Blu-ray (registered trademark) Discs, magneto-optical disks, flash memories, and card-type recording media. The above recording medium may also be a non-volatile memory device such as a RAM, ROM, or HDD that is an internal storage device included in a server device configured to be communicable with the smartphone 1. In this case, the smartphone 1 downloads the program from the server device.

[0118] The functions of the control unit 11 may be realized by one or more processors or semiconductor chips. The control unit 11 may further include a co-processor such as a SoC (System-on-a-Chip), MCU (Micro Control Unit), or FPGA (Field-Programmable Gate Array). The control unit 11 may perform various controls by collaborating both the CPU and the co-processor or selectively using one of them.

[0119] The processing units of the flowcharts shown in FIGS. 5, 6, and 7 are divided according to the main processing contents to facilitate understanding of the processing of the control unit 11, and are not limited by the way of dividing the processing units or their names. The processing units of the flowchart may be further divided into more processing units according to the processing contents. One processing unit may be divided to include more processes. The order of the processes may be appropriately changed within a range not affecting the gist.

[0120] Each functional unit shown in FIG. 1 shows a functional configuration, and the specific implementation form is not particularly limited. It is not necessarily required to install hardware corresponding to each functional unit individually, and it is also possible to adopt a configuration in which one processor executes a program to realize the functions of a plurality of functional units. A part of the functions realized by software in the above-described embodiments may be realized as hardware, or a part of the functions realized by hardware may be realized by software. In addition, the specific detailed configuration of the other parts of the smartphone 1 can be arbitrarily changed within a range not departing from the gist.

Description of Reference Numerals

[0121] 1... Smartphone (display device), 2... Printer, 10... Main body, 11... Control unit, 12... Processor, 13... Memory, 14... Touch panel (display unit), 15... Communication interface, 100... Printing system, 121... Display control unit, 122... Reception unit, 131... Operating system, 132... Application program, 133... Document information storage unit, 134... Image information storage unit, 135... Set value, 141... Display (display screen), 142... Touch sensor, 200... Preview screen, 201... Document display area, 202... Thumbnail display area, BT... Button image, BT1... First button image (button), BT2... Second button image, DW... Downward, MC... Lower end position, OP1... Operation (second operation), OP2... Operation (third operation), PG, PG1, PG2... Page image, PP... Printed image, PS... Thumbnail image, PT... Page top image, SG... Thumbnail image group, TL... Upper end position, UP... Upward.

Claims

1. A display method for displaying a document by a display device having a display screen, comprising: a display step of displaying, in a display area arranged on the display screen, a page image that is an image of a page constituting the document and a thumbnail image of the page; a first reception step of receiving a first operation for instructing enlargement of the page image; an enlargement step of enlarging and displaying the page image displayed in the display area when the first operation is received; In the display step, displaying a thumbnail image group including the thumbnail images of a plurality of the pages in the display area; In the enlargement step, moving the display position of the thumbnail image group in a first direction in the display area, enlarging the thumbnail image group more than before the execution of the enlargement step, and for at least some of the thumbnail images included in the thumbnail image group, making a part of the thumbnail image hidden and updating the display of the display area; A display method, wherein an enlargement ratio for enlarging the thumbnail image group more than before the execution of the enlargement step is determined based on whether the shape of the page located at the head of the pages constituting the document is vertically long or horizontally long.

2. A display method for displaying a document by a display device having a display screen, comprising: a display step of displaying, in a display area arranged on the display screen, a page image that is an image of a page constituting the document and a thumbnail image of the page; a first reception step of receiving a first operation for instructing enlargement of the page image; an enlargement step of enlarging and displaying the page image displayed in the display area when the first operation is received; In the display step, displaying a thumbnail image group including the thumbnail images of a plurality of the pages in the display area; In the enlargement step, move the display position of the thumbnail image group in a first direction in the display area, enlarge the thumbnail image group more than before the execution of the enlargement step, for at least some of the thumbnail images included in the thumbnail image group, make a part of the thumbnail image hidden, and update the display of the display area. A display method for determining an enlargement ratio for enlarging the thumbnail image group more than before the execution of the enlargement step based on whether the ratio of the portrait pages among the pages constituting the document is equal to or greater than a determination criterion or less than the determination criterion.

3. The display method according to claim 1 or claim 2, wherein the thumbnail image group includes a plurality of thumbnail images having the same shape as the page, and the thumbnail images are displayed such that the height positions of the upper ends of the plurality of thumbnail images are aligned in the height direction of the display screen.

4. In the display step, display operation buttons in the display area. The display method according to any one of claims 1 to 3, wherein in the first reception step, when the button is operated, the first operation is received.

5. The display method according to any one of claims 1 to 4, wherein in the enlargement step, a process of gradually enlarging the display size of the page image displayed in the display area is executed.

6. A second reception step of receiving a second operation for instructing movement of the thumbnail image moved in the first direction in the enlargement step in a second direction opposite to the first direction, and A movement step of moving the thumbnail image to a position overlapping the page image when the second operation is received. The display method according to any one of claims 1 to 5.

7. The display method according to claim 6, wherein in the moving step, the thumbnail image is enlarged as compared with before the execution of the moving step.

8. A third receiving step of receiving a third operation for instructing movement in the first direction with respect to the thumbnail image moved in the second direction in the moving step; A re-moving step of moving the thumbnail image to the display position before the execution of the moving step when the third operation is received, the display method according to claim 6 or claim 7.

9. A display unit having a display screen; A display control unit that displays a page image, which is an image of a page constituting a document, and a thumbnail image of the page in a display area arranged on the display screen; A receiving unit that receives an operation, The display control unit, A display process of displaying a thumbnail image group including the thumbnail images of a plurality of the pages in the display area; When a first operation for instructing enlargement of the page image is received by the receiving unit, a display update process of enlarging and displaying the page image displayed in the display area; In the display update process, The display position of the thumbnail image group is moved in a first direction in the display area, the thumbnail image group is enlarged as compared with before the execution of the display update process, and for at least a part of the thumbnail images included in the thumbnail image group, a part of the thumbnail image is hidden; A display device that determines an enlargement ratio for enlarging the thumbnail image group as compared with before the execution of the display update process based on whether the shape of the page located at the head of the pages constituting the document is portrait or landscape.

10. A display unit having a display screen; A display control unit that displays a page image, which is an image of a page constituting a document, and a thumbnail image of the page in a display area arranged on the display screen; A reception unit that receives an operation, The display control unit A display process for displaying a thumbnail image group including the thumbnail images of the plurality of pages in the display area, When the reception unit receives a first operation for instructing enlargement of the page image, a display update process for enlarging and displaying the page image displayed in the display area is performed. In the display update process, Move the display position of the thumbnail image group in the first direction in the display area, enlarge the thumbnail image group more than before the execution of the display update process, and for at least some of the thumbnail images included in the thumbnail image group, make a part of the thumbnail image hidden, A display device that determines an enlargement rate for enlarging the thumbnail image group more than before the execution of the display update process based on whether the ratio of the portrait pages among the pages constituting the document is equal to or greater than a determination criterion or less than the determination criterion.

Images