JP4992437B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a display device with improved visibility when enlarging an image displayed on a screen by simple processing.

Conventionally, a display device having a display panel for displaying a data file, such as a personal computer, a PDA (Personal digital assistants), or a mobile phone, is known. In such a display device, for example, in order to improve visibility, a display image displayed on the display panel can be enlarged and displayed on the screen (see, for example, JP-A-8-87521).
JP-A-8-87521

  However, when the display image is enlarged, for example, part of the page may not be displayed outside the screen, and the user may not be able to view the entire page at once. Therefore, in order to browse the entire page, the display image has to be moved up and down or left and right by a scroll operation, which sometimes makes the operation troublesome. In particular, when a document file is displayed, it is desirable that at least one character string can be browsed at a time because the document is read sequentially line by line. However, if the display image is simply enlarged, the display of the character string is interrupted in the middle of each line, and the screen needs to be scrolled in order to read the character string for one line to the end. Furthermore, after reading the character string for one line, the screen must be scrolled again to display the beginning of the next one-line character string. Therefore, it is necessary to frequently scroll the screen in order to read the document.

  Further, when the display panel is an electrophoretic method, it takes time to switch the screen display. Therefore, since the waiting time of the user becomes long, when the display switching is frequently required, the waiting time is increased, so that the user may find the display switching particularly troublesome.

  An object of the present invention is to provide a display device with improved operability when displaying an enlarged display image by a simple process in order to solve the above-described problems.

The display device according to claim 1 includes a display panel having a rectangular display area having an aspect ratio a (where a> 1) having a first area and a long side and a short side, and reading a rectangular original image. And a control device for controlling display of the original image on the display panel, wherein the control means generates an enlarged image obtained by enlarging the original image at a predetermined magnification. And the enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and an area equal to or less than the first area. An image demarcating unit that demarcates a partially magnified image; and a display control unit that displays the entire partially magnified image in the display area, wherein the predetermined magnification is greater than a times and less than or equal to n times (however, n Is an integer of 2 or more) Image definition means, the said enlarged image in a first division line which extends parallel to the short side direction, and defining the enlarged partial image by dividing the entire 1 / (n ²⁾ less wide, the And a display control unit configured to combine a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second parting line extending in parallel with the long side direction are sequentially arranged in the long side direction and combined. Generating and displaying the combined image in the display area.

The display device according to claim 2 has a display panel having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side, and reading a rectangular original image. And a control device for controlling display of the original image on the display panel, wherein the control means generates an enlarged image obtained by enlarging the original image at a predetermined magnification. And the enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and an area equal to or less than the first area. An image demarcating unit for demarcating a partially magnified image; and a display control unit for displaying the entire partially magnified image in the display area, wherein the predetermined magnification is greater than n times and less than (a · n) times (However, n is an integer of 2 or more. The image defining means, the said enlarged image in a first division line which extends parallel to the short side direction, the entire 1 / ((a · n)
² ) The partial enlarged image is demarcated by dividing it with the following width, and the display control means is obtained by dividing the partial enlarged image into n by a second dividing line extending in parallel with the long side direction. A combined image in which n temporary images are sequentially arranged in the long side direction and combined is generated, and the combined image is rotated by 90 degrees and displayed in the display area.

The display device according to claim 3 includes a display panel having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side, and reading a rectangular original image. And a control device for controlling display of the original image on the display panel, wherein the control means generates an enlarged image obtained by enlarging the original image at a predetermined magnification. And the enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and an area equal to or less than the first area. Image defining means for defining a partially magnified image; and display control means for displaying the entire partially magnified image in the display area, wherein n is an integer equal to or greater than 1, and the predetermined magnification is greater than n times a · When n times or less, The image demarcating means divides the enlarged image by a first dividing line extending in parallel with the long side direction with a width of 1 / ((2n) ² ) or less of the whole to define the partially enlarged image. The display control means is a combination in which n provisional images obtained by dividing the partial enlarged image into n parts by a second dividing line extending in parallel with the short side direction are sequentially arranged in the short side direction and combined. An image is generated, and the combined image is rotated 90 degrees and displayed in the display area.

The display device according to claim 4 includes a display panel having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side, and reading a rectangular original image. And a control device for controlling display of the original image on the display panel, wherein the control means generates an enlarged image obtained by enlarging the original image at a predetermined magnification. And the enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and an area equal to or less than the first area. Image demarcating means for demarcating a partially magnified image, and display control means for displaying the entire partially magnified image in the display area, wherein n is an integer of 2 or more, and the predetermined magnification is (n-1) When it is larger than n times and smaller than n times, The image demarcating means divides the magnified image by a first dividing line extending in parallel with the long side direction and divides the magnified image by a width of 1 / (n ² ) or less of the whole to demarcate the partially magnified image, The display control means is a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second dividing line extending in parallel with the short side direction are sequentially arranged in the short side direction and combined. And the combined image is displayed in the display area.

According to a fifth aspect of the present invention, there is provided a display device comprising: a display unit having a rectangular data display area; a reading unit that reads original image data corresponding to a rectangular original image; and the original image according to an enlargement ratio input by a user. Enlarged image generation means for generating enlarged image data for displaying an enlarged image on the basis of the original image data, and outputting at least a part of the enlarged image data or the original image data to the display means, A display device comprising a control means for displaying at least a part of the enlarged image or the original image in the display area in a data display area, wherein the first direction is one of a vertical direction and a horizontal direction. wherein an enlarged image and the image determining means for determining the divided partial enlarged image with a predetermined width, said data display area on the divided display area of the n (n is an integer of 2 or more) in And a partitioning means demarcating the partially enlarged image with including from one end in a second direction perpendicular to the first direction to the other, the area is not more than the area of the data display area, the control means, said part of the enlarged image data corresponding to the enlarged partial image output to the display means, be one that displays the entirety of the enlarged partial image in the data display area, the enlarged partial image In the second direction, n auxiliary images are generated to generate n auxiliary images, and the n auxiliary images are sequentially assigned to the corresponding divided display areas to display the entire partial enlarged image. .
The display device according to claim 6 is the display device according to claim 5, wherein the partitioning unit matches a second direction of the original image with a short side direction of the data display area, and When the physical length in the second direction of the partially enlarged image is equal to or less than the value obtained by multiplying the length of the short side direction of the data display area by n, the n divided display areas are set to the data display area. It arrange | positions in a longitudinal direction, It is characterized by the above-mentioned.
The display device according to claim 7 is the display device according to claim 5, wherein the partitioning unit has a physical length in the second direction of the partial enlarged image in the short side direction of the data display area. When the length is larger than the value obtained by multiplying the length by n, the data display area is divided into n divided display areas arranged in the short side direction, and the control means sets the partial enlarged image to a second enlarged image. In the direction, the image is divided into n auxiliary images, and each of the n auxiliary images is displayed in correspondence with the n divided regions and rotated by 90 degrees with respect to the original image. The entire enlarged image is displayed in the data display area by matching the direction and the long side direction of the data display area.
The display device according to claim 8 is the display device according to any one of claims 5 to 7, wherein the image determination unit arranges characters or symbols in one line in the original image in a vertical direction. The partially enlarged image is determined with the horizontal direction of the original image as the first direction, and the original image is a horizontal written document in which one line of characters or symbols are arranged in the horizontal direction. The partial enlarged image is determined with the vertical direction of the original image as the first direction.
The display device according to claim 9 includes a display unit having a rectangular data display area, a reading unit that reads original image data corresponding to a rectangular original image, and the original image according to an enlargement ratio input by a user. Enlarged image generation means for generating enlarged image data for displaying an enlarged image on the basis of the original image data, and outputting at least a part of the enlarged image data or the original image data to the display means, A display device comprising a control means for displaying at least a part of the enlarged image or the original image in the display area in a data display area, wherein the first direction is one of a vertical direction and a horizontal direction. And determining an enlarged partial image obtained by dividing the enlarged image by a predetermined width in a second direction orthogonal to the first direction. And the area is equal to or less than the area of the data display area, and the control means outputs a part of the enlarged image data corresponding to the partial enlarged image to the display means, The entire partial enlarged image is displayed in the data display area. When the original image is composed of a vertically written document in which a single line of characters or symbols are arranged in the vertical direction, the horizontal direction of the original image is displayed. When the partial enlarged image is determined with the direction as the first direction, and the original image is composed of a horizontally written document in which one line of characters or symbols are arranged in the horizontal direction, the vertical direction of the original image is set as the first direction. The partial enlarged image is determined as the direction of the image.

The display device according to claim 10 is the display device according to claim 9 , wherein the control means includes a second direction of the original image displayed in the data display area and a short side direction of the data display area. The partial enlarged image is rotated by 90 degrees with respect to the original image, and the second direction of the partial enlarged image and the long side direction of the data display area are made to coincide with each other in the data display area. It is characterized by displaying.

Display device according to claim 11, a display device according to claim 10, wherein the control means has a length in the short side direction of the second direction of the physical length the data display area of the enlarged partial image The partial enlarged image is rotated by 90 degrees with respect to the original image, and the second direction of the partial enlarged image is set to the length of the data display area. The data is displayed in the data display area so as to coincide with the side direction.

The display device according to claim 12 is the display device according to any one of claims 8 to 11 , wherein the original image data is a vertically written document or a horizontally written document. The image determining means determines the partial enlarged image including from one end to the other end in the second direction of the enlarged image by referring to the document data. And

A display device according to claim 13 is the display device according to any one of claims 8 to 11 , wherein the original image data is analyzed to determine whether the original image is a vertical writing document or horizontal writing. A document determination unit configured to determine whether the document is a document, and the image determination unit includes the partial enlargement including from one end to the other end in the second direction of the enlarged image based on a determination result by the document determination unit. An image is determined.

  According to the display device of the present invention, the partially enlarged image includes the original image from one end to the other end. Accordingly, the display panel simultaneously displays from one end to the other end of the enlarged image corresponding to one end to the other end of the original image. For example, when the original image is a document file, the user scrolls the screen. Even if it is not, it is possible to list from one end to the other end of the original image in the direction parallel to the dividing line, and it is possible to reduce the complexity of operation of the display device when the original image is enlarged and displayed.

  According to the display device of the present invention, the partially enlarged image includes at least one end to the other end in the second direction. Therefore, the user can list the second direction from one end to the other end without scrolling the screen, and the complexity of the operation of the display device when the original image is enlarged and displayed. Can be reduced.

  In addition, since the partially enlarged image is determined based on the determination result by the document determination unit, document data specifying whether the original image is a vertically written document or a horizontally written document is not added to the original image data. Even in this case, at least the direction in which the document is read can be displayed on the display panel from one end to the other at the same time.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, directions such as up and down, front and rear, and left and right are used to describe each component of the display device 1 when the display device 1 according to the embodiment of the present invention is used. This is the expression used for.

  FIG. 1 shows a display device 1 according to an embodiment of the present invention. The display device 1 includes a display panel 2, a control circuit 3 (see FIG. 2) that controls the display panel 2, and a main body 4 that surrounds and holds the periphery of the display panel 2, and a user performs a predetermined operation. This is a device for displaying an image on the display panel 2. The display device 1 is generally configured to be a so-called portrait type in which the long side of the display panel 2 is used in the vertical direction and the short side is used in the horizontal direction. In this embodiment, the display panel 2 has an aspect ratio of 1.33 (ratio of long side to short side). Note that the aspect ratio of the display panel 2 is not limited to 1.33, and may take an appropriate value.

  The display panel 2 is an electrophoretic display panel. The display panel 2 forms a sealed space by placing two transparent substrates located on the front side facing each other with a spacer through a predetermined distance, and in this sealed space, the fine particles are colored with the fine particles. The display liquid is filled with display liquid dispersed in different dispersion media, and further includes means for applying an electric field to the display liquid, and has a display area of a predetermined area. By applying an electric field to the display liquid, the fine particles in the display liquid move to the transparent plate side, and the color of the fine particles appears on the surface of the panel. Further, by changing the direction of the electric field in the reverse direction, the fine particles move to the back side, and the color of the dispersion medium appears on the surface of the panel. Thus, the display panel 2 can display an image by controlling the direction of the electric field applied to the display liquid.

  The main body 3 on the upper right side of the display panel 2 is provided with a memory card insertion slot 5 so that an original image for forming a display image can be taken into the display device 1 so that a memory card 6 can be inserted.

  As shown in FIG. 2, the control circuit 3 includes a CPU 11, a ROM 12, a RAM 13, an acceleration sensor 14, a memory card interface 15 (memory card I / F 15) that can be connected to the memory card 6, and a display panel driver 16. And a key interface 17 (key I / F 17).

  The CPU 11 is an arithmetic processing unit that controls the entire display device 1, and is connected to each of the ROM 12, the RAM 13, the acceleration sensor 14, the memory card I / F 15, the display panel driver 16, and the key I / F 17. ing.

  The ROM 12 is a non-rewritable memory, and stores various control programs executed by the CPU 11 and fixed value data that the control program refers to at the time of execution.

  The RAM 13 is a rewritable memory for storing various data required by the control program executed by the CPU 11. Further, the RAM 13 includes a page number memory 13a, a displayed page start memory 13b, a displayed magnification memory 13c, a page data expansion area 13d, and a VideoRAM 13e. The page number memory 13a stores the page number of the display image displayed on the display panel 2. The displayed page start memory 13b stores the display start position S of the display image. The display magnification memory 13c stores the magnification of the display image. In the present embodiment, one of 100%, 133%, 200%, and 266% selected by the user is stored. The page data expansion area 13d is an area where the original image data read from the memory card 6 is expanded at the enlargement ratio stored in the display magnification memory 13c. At least a part of the original image data expanded in the page data expansion area 13d is sent to the VideoRAM 13e. The VideoRAM 13e stores display data generated based on the data sent from the page data expansion area 13d.

  The acceleration sensor 14 is a sensor that detects gravitational acceleration and detects the orientation of the display panel 2 with respect to the user. The memory card I / F 15 is an interface for transmitting and receiving data between the memory card 6 inserted into the memory card insertion slot 5 and the CPU 11. The display panel driver 16 is connected to the display panel 2, sends display data output from the VideoRAM 13 e to the display panel 2, and causes the display panel 2 to display a display image. A key 7 is connected to the key I / F 17, and an image enlargement or reduction command by the user is input to the control circuit 3 via the key 7.

  The key 7 includes a return key 7a and a next key 7b provided in front of the main body 3 below the display panel 2, and an enlargement key 7c and a reduction key 7d provided between the return key 7a and the next key 7b. Consists of. The enlargement key 7c accepts a display image enlargement instruction, and the reduction key 7d accepts a display image reduction instruction. A power switch 8 is provided in the main body 3 above the display panel 2. When the power switch 8 is turned on by the user, the CPU 11 starts to supply power to the display panel 2 and the control circuit 3.

  On the other hand, the memory card 6 readable by the display device 1 includes a plurality of page data storage areas 6-1, 6-2,..., 6-n (where n is an integer greater than 1), and an original image The original image data corresponding to is stored. In each page data storage area, page display data corresponding to data for one page of the original image and page attribute data indicating attributes of the page display data are stored together. The page attribute data is the direction of data for one page of the original image, that is, whether it is portrait mode or landscape mode, and is described in the document file when the page display data is a document file. This is data indicating the direction of the written character string, that is, whether it is horizontal writing or vertical writing. Each page display data is given a page number, and the page display data is managed according to the page number.

  Next, the operation of the display device 1 having the above configuration will be described. When the memory card 6 is inserted into the memory card insertion slot 5 in order to display the original image stored in the memory card 6, the CPU 11 stores page data storing page display data having a pre-specified page number. The area 6-i (where i is an integer from 1 to n) is accessed to read page display data. Then, the control circuit 3 displays an image corresponding to the page display data on the display panel 2. In this embodiment, when the page display data stored in one page data storage area is displayed in accordance with the size of the display panel 2 (reference size), the rectangular image displayed on the display panel 2 is displayed. Is referred to as a page image P. In addition, among the enlarged images WP created by enlarging the page image P, images actually displayed on the display panel 2 are referred to as partially enlarged images WPs.

  At this time, the control circuit 3 displays the page image P such that the long side direction thereof coincides with the long side direction of the display panel 2. That is, when the page image P is in portrait mode (vertically long), as shown in FIG. 1, the control circuit 3 makes the display panel 2 vertically long, that is, the long side for the user who is viewing the display panel 2. Is used so that the vertical direction is in the vertical direction and the short side is in the horizontal direction. On the other hand, when the page image P is in the landscape mode, the control circuit 3 causes the display panel 2 to be horizontally long as shown in FIG. 3, that is, the long side is horizontal to the user and the short side is vertical. Use as follows. In the following description, a case will be described in which the page display data is composed of a horizontally written document file in the portrait mode, and the page image P is displayed on the display panel 2 as shown in FIG.

  As shown in FIG. 1, when the page image P is displayed on the display panel 2, when the enlargement key 7c is pressed once, the page image P is enlarged to 133%. Next, when the enlargement key 7c is pressed again, the page image P is enlarged to 200%. When the enlargement key 7c is pressed again, the page image P is enlarged to 266%.

  On the other hand, when the reduction key 7d is pressed while the page image P is displayed on the display panel 2 in an enlarged state, the page image P is sequentially reduced in the reverse order to the above-described enlargement. Therefore, the user can enlarge the page image P at any of 100%, 133%, 200%, and 266% by pressing the enlargement key 7c and the reduction key 7d as appropriate.

  For example, when the page image P is displayed on the display panel 2 as shown in FIG. 1, when the enlargement key 7c is pressed, the page image P is enlarged to 133%. At this time, the enlarged image WP obtained by enlarging the page image P to 133% protrudes from the display panel 2 as shown in FIG. Therefore, as shown in FIG. 4B, the partially enlarged image WPs is rotated by 90 degrees with respect to the page image P, and the row direction of the partially enlarged image WPs (partially enlarged image WPs) is extended in the long side direction of the display panel 2. The horizontal direction of

  When enlarging the page image P to 200%, as shown in FIG. 4C, a division boundary D extending in parallel with the short side direction is displayed, and the display area of the display panel 2 has its length. Divided into two stages in the side direction. On the other hand, in the partially enlarged image WPs, the character string for one line is divided into two, and the divided images are arranged above and below the division boundary D, respectively. That is, the divided images are displayed on the display panel 2 as a combined image obtained by combining the divided images in the vertical direction via the division boundary D.

  When the page image P is enlarged to 266%, as shown in FIG. 4D, a division boundary D extending in parallel with the long side direction is displayed, and the display area of the display panel 2 is shortened. Divided into two stages in the side direction. On the other hand, the partial enlarged image WPs is rotated by 90 degrees with respect to the page image P, the line direction of the partial enlarged image WPs matches the long side direction of the display panel 2, and the character string for one line is further divided into two. The divided images are arranged and displayed above and below the division boundary D, respectively. That is, the divided images are displayed on the display panel 2 as a combined image obtained by combining the divided images in the vertical direction via the division boundary D.

  As shown in FIGS. 4B and 4D, the direction of the partially enlarged image WPs is rotated by 90 degrees with respect to the page image P in accordance with the enlargement ratio and displayed, whereby the long side direction of the display panel 2 is changed. It can be used effectively. In addition, the display area of the display panel 2 is divided into two, the partial enlarged image WPs is divided, and the divided partial enlarged image WPs is displayed in each display area. From the front end to the end can be displayed on the display panel 2 at the same time. Therefore, the user can read a character string for one line from the beginning to the end without performing a display switching operation such as screen scrolling.

  As can be seen from FIG. 4A and FIG. 4B, when the page image P is displayed on the display panel 2 as shown in FIG. It is difficult to insert a character string for one line written horizontally in the partially enlarged image WPs from the beginning to the end. Therefore, in order to make the partial enlarged image WPs include the beginning to the end of the character string for one line, the shape of the partial enlarged image WPs is changed as appropriate according to the enlargement ratio, and the partial enlarged image WPs is changed as necessary. Is rotated or divided. Therefore, the partial enlarged image WPs changes its shape according to the enlargement ratio, and the length in the column direction orthogonal to the row direction is changed as appropriate. This length is a value set in advance according to the aspect ratio and the enlargement ratio of the display panel 2, and is referred to as “display area height H” in the following description.

  In the present embodiment, as shown in FIG. 5A, the display area height H is predetermined according to the enlargement ratio and stored in the display area height table 12b. The display area height H is a relative value determined on the basis of the length (height) of the long side of the page image P. In the present embodiment, the reference value is 100. Further, the display area height H is determined so that the total area of the partially enlarged images WPs specified by the display area height H is equal to or less than the area of the display panel 2. Therefore, the entire partial enlarged image WPs can be displayed on the display panel 2 at a time.

  Next, the relationship between the display area height H shown in FIG. 5A and the partially enlarged image WPs will be described. FIG. 5B to FIG. 5E schematically show a page image P and an enlarged image WP obtained by enlarging the page image P at 133%, 200%, and 266%, respectively. As described above, the page image P is displayed such that the entire page image P matches the size of the display panel 2, so that the enlarged image WP protrudes from the size of the display panel 2 regardless of the enlargement ratio. Therefore, the control circuit 3 selects a region indicated by the alternate long and short dash line as the partially enlarged image WPs as shown in each of FIGS. 5B to 5E in the enlarged image WP. That is, the partial enlarged image WPs is obtained by dividing the enlarged image WP by the display area height H in the long side direction (direction orthogonal to the row direction) and from one end (the top) of the short side direction (row direction) to the other. It is defined to include up to the end (end).

  In general, the display area height H has the following relationship with respect to the aspect ratio a of the display panel 2 and the enlargement ratio of the page image P according to the attributes of the page image P. For example, as shown in FIG. 6, the size of the display panel 2 is L as the short side and aL as the long side.

(1) When the page image P is in the landscape mode for vertical writing or the portrait mode for horizontal writing, and the enlargement ratio is not less than a times and not more than n ₀ times (where n ₀ is an integer of 2 or more).

Since the partially enlarged image WPs is divided into n ₀ and combined in the vertical direction while maintaining the orientation of the characters to generate a combined image, the height of the combined image is n ₀ H. Since this n ₀ H cannot be displayed if the length aL of the long side of the display panel 2 is exceeded, the display area height H must satisfy the following condition.

(Equation 1)
n ₀ H ≤ aL
H ≦ (a / n ₀ ) L
In the present embodiment, since the length n ₀ aL of the long side of the enlarged image WP magnified n ₀ times is 100,

(Equation 2)
H ≦ (a / n ₀ ) L = (1 / n ₀ ² ) n ₀ aL = 100 / (n ₀ ² )
That is, H ≦ 100 / (n ₀ ² )
It becomes.

(2) The page image P is in the landscape mode for vertical writing or the portrait mode for horizontal writing, and the enlargement ratio is n ₀ times or more and n ₀ · a times or less.

Since the partially enlarged image WPs is divided into n ₀ and combined in the vertical direction while maintaining the orientation of the characters to generate a combined image, the height of the combined image is n ₀ H. Since this n ₀ H cannot be displayed if the length L of the long side of the display panel 2 is exceeded, the display area height H must satisfy the following condition.

(Equation 3)
n ₀ H ≦ L
H ≦ (1 / n ₀ ) L
In the present embodiment, since the length n ₀ a ² L of the long side of the enlarged image WP enlarged by n ₀ · a times is 100,

(Equation 4)
H ≦ (1 / n ₀ ) L = (1 / (n ₀ ² · a ² )) n ₀ a ² L = 100 / (n ₀ ² · a ² )
That is, H ≦ 100 / (n ₀ ² · a ² )
It becomes.

(3) The page image P is in portrait mode for vertical writing or landscape mode for horizontal writing, and the enlargement ratio is n ₁ times or more and n ₁ · a times or less (where n ₁ is an integer of 1 or more). in the case of.

Since the partially enlarged image WPs is divided into 2n ₁ and combined in the vertical direction while maintaining the direction of the characters to generate a combined image, the height of the combined image is 2n ₁ H. Since this 2n ₁ H cannot be displayed beyond the length aL of the long side of the display panel 2, the display area height H must satisfy the following condition.

(Equation 5)
H ≤ aL
H ≦ (a / (2n ₁ )) L
In the present embodiment, since the length n ₁ aL of the long side of the enlarged image WP enlarged to n ₁ · a times is 100,

(Equation 6)
H ≦ (1 / (2n ₁ )) anL
That is, H ≦ 100 / 2n ²
It becomes.

  At this time, the aspect ratio is

(Equation 7)

It needs to be the following. When the page image P is multiplied by a, the partially enlarged image WPs is rotated 90 degrees with respect to the page image P and the display area is divided into two. Since the page image P is the short side L and the long side aL, the enlarged image WP multiplied by a has a short side of aL and a long side of a ² L.

Since the combined image cannot be displayed in the display area unless the long side a ² L of the partially enlarged image WPs divided into two is shorter than the long side L of the display area, the following conditions are required. .

(Equation 8)

It becomes. Similarly, when the page image P is multiplied by a, when the partial enlarged image WPs is rotated 90 degrees with respect to the page image P to be divided into three or four, the aspect ratio a is

(Equation 9)

(4) The page image P is in the portrait mode of vertical writing or landscape mode of horizontal writing, and the enlargement ratio is not less than (n ₀ −1) times and not more than n ₀ times (however, n ₀ is not less than 2) Integer).

The partially enlarged image WPs is divided into n ₀ and combined in the vertical direction while maintaining the direction of the characters to generate a combined image. Therefore, the length of the long side of the combined image is n ₀ H. Since this n ₀ H cannot be displayed beyond the length L of the short side of the display panel 2, the display area height H must satisfy the following conditions.

(Equation 10)
n ₀ H ≦ L
In the present embodiment, since the length n ₀ L of the short side of the enlarged image WP magnified n ₀ times is 100,

(Equation 11)
H ≦ (1 / n ₀ ) L
That is, H ≦ 100 / (n ² )
It becomes.

  Hereinafter, the uppermost end of an image such as the page image P or the enlarged image WP is referred to as a page head, and the lowermost stage of the image is referred to as a page tail. Note that the upper, lower, left, and right directions of the image are directions defined when the image is arranged in an upright state. The page head side position of the partially enlarged image WPs is referred to as a display start position S. The partial enlarged image WPs can be changed by appropriately setting the display start position S.

  The enlarged display setting table 12c will be described with reference to FIG. The enlarged display setting table 12c is a table for determining the display method of the partially enlarged image WPs described with reference to FIG. More specifically, the enlarged display setting table 12c is a table in which an enlargement ratio, a display direction of an image displayed at the enlargement ratio, and a display area dividing method of the display panel 2 are associated with each other. In this embodiment, four types of enlarged display tables 12c are stored in advance according to the page attribute data.

  FIG. 7A is an enlarged display table 12c1 used for the page image P in the portrait mode of vertical writing, and FIG. 7B is an enlarged display table 12c2 used for the page image P of the landscape mode in vertical writing. 7C is an enlarged display table 12c3 used for the page image P in the horizontal portrait mode, and FIG. 7D is an enlarged display table used for the page image P in the horizontal landscape mode. 12c4.

  In the present embodiment, the case where the page attribute data is in horizontal writing and portrait mode is described, and therefore, description will be made with reference to the enlarged display table 12c3 shown in FIG. Referring to the enlargement display table 12c3, when the enlargement ratio is 100%, the “display direction” is vertically long, so that the page image P with the enlargement ratio of 100% has a column direction that matches the long side direction of the display panel 2. Is displayed. Since the “display panel dividing method” is “none”, the page image P is displayed without dividing the display panel 2 (see FIG. 1).

  Since the “display direction” is horizontally long when the enlargement rate is 133%, the partially enlarged image WPs of 133% is relative to the page image P so that the row direction coincides with the long side direction of the display panel 2. It is rotated 90 degrees and displayed. Since the “display panel dividing method” is “none”, the partially enlarged image WPs is displayed without dividing the display panel 2 (see FIG. 4B).

  Further, since the “display direction” is vertically long when the enlargement ratio is 200%, the 200% partially enlarged image WPs is displayed so that the column direction coincides with the long side direction of the display panel 2. In addition, since the “display panel dividing method” is “the long side direction is divided into two”, the longitudinal direction of the display panel 2 is divided into two stages by the dividing boundary D, and the partially enlarged image WPs is divided into two parts in the vertical direction. It arrange | positions (refer FIG.4 (c)).

  Further, when the enlargement ratio is 266%, the “display direction” is horizontally long, so the partially enlarged image WPs of 266% is relative to the page image P so that the row direction matches the long side direction of the display panel 2. It is rotated 90 degrees and displayed. In addition, since the “display panel dividing method” is “dividing the short side direction into two”, the short side direction of the display panel 2 is divided into two stages by the division boundary D, and the partially enlarged image WPs is divided into two parts in the vertical direction. It arrange | positions (refer FIG.4 (d)).

  In this embodiment, when the page attribute data is in the vertical writing and portrait mode, or when the page attribute data is in the horizontal writing and landscape mode, the maximum enlargement rate is limited to 200%, and the enlargement key 7c is set. Even if pressed further, the enlargement ratio does not change.

  With reference to FIG. 8, the main process performed with the display apparatus 1 is demonstrated. The main process is a process that starts when the display device 1 is powered on. When the power is turned on, for example, the CPU 11 reads out the page display data of the page number “1” from the memory card 6 and expands it in the page data expansion area 13d (see FIG. 2). Based on the page display data, The page image P with the page number “1” is displayed on the display panel 2.

  Next, the CPU 11 determines whether or not the enlargement key 7c or the reduction key 7d (see FIG. 1) has been pressed (S2). When the enlargement key 7c or the reduction key 7d is pressed (S2: Yes), the CPU 11 determines the enlargement ratio of the image to be displayed on the display panel 2 by the enlargement ratio changing process (S4), and the display process (S12). The partial enlarged image WPs corresponding to the enlargement ratio is displayed on the display panel 2.

  On the other hand, when the enlargement key 7c or the reduction key 7d is not pressed (S2: No), the CPU 11 next determines whether or not the next key 7b is pressed (S6). When the next key 7b is pressed, a page turning process (S10) is performed on the page image P or the partially enlarged image WPs displayed on the display panel 2, and the next page image P in the page turning direction or Switch to the partially enlarged image WPs on the tail side of the page.

  When the next key 7b is pressed (S6: Yes), the CPU 11 refers to the display area height table 12b and acquires the display area height H corresponding to the selected enlargement ratio (S8). Next, page feed processing for determining the display start position S of the next partially enlarged image in the page feed direction is executed (S10). Then, the partially enlarged image WPs determined based on the display start position S is displayed on the display panel 2 by the display process (S12).

  On the other hand, when the next key 7b is not pressed (S6: No), the CPU 11 determines whether or not the return key 7d is pressed (S14). When the return key 7d is pressed, the CPU 11 performs page return processing (S18) on the page image P or the partially enlarged image WPs displayed on the display panel 2, and the previous page image P or page in the page return direction. Switch to the top partial enlarged image WPs. When the return key 7d is not pressed (S14: No), the process returns to S2.

  When the return key 7d is pressed (S14: Yes), the CPU 11 refers to the display area height table 12b and acquires the display area height H corresponding to the selected enlargement ratio (S16). Then, the CPU 11 executes a page return process for determining the display start position S of the next partial enlarged image in the page return direction (S18), and the part determined based on the display start position S by the display process (S12). An enlarged image is displayed on the display panel 2 (S12). After the display process (S12) ends, the process returns to S2.

  With reference to FIG. 9, the page turning process will be described. The page feed process is a process in which, when the next key 7b is pressed, the CPU 11 determines the display start position S of the partially enlarged image WPs located on the page tail side in the page feed direction.

  First, the CPU 11 acquires the display start position S of the page image P or the partially enlarged image WPs currently displayed on the display panel 2 from the displayed page start memory 13b, and displays the display area height at the acquired display start position S. H is added, and it is determined whether or not the value obtained by the addition is 100 or more (S102).

  The relationship between the display start position S and the display area height H will be described with reference to FIG. Referring to the display area height table 12b (refer to FIG. 5A), the display area height H in the case where the display is enlarged by 133% is “56”, so when the display start position S is “44”, A value obtained by adding the display area height H to the display start position S is “100”. That is, CPU 11 determines that partial enlarged image WPs from display start position S “44” to the end of the page is displayed on display panel 2. As a result, the CPU 11 determines that the non-display area of the enlarged image WP does not exist on the page tail side with respect to the page display data that is currently partially displayed. Therefore, the CPU 11 determines that the next image to be displayed in the page feed direction is the page display data of the next page.

  Referring to FIG. 10B, a partially enlarged image WPs in which the page image P is enlarged to 133% is displayed, and the display start position S is “0”. As shown in FIG. 10B, when the display start position S is “0”, the value obtained by adding the display area height H to the display start position S is “56”, which is 100 or less. In this case, the CPU 11 determines that an undisplayed area of the enlarged image WP having the height “44” remains in the page turning direction, and the partial enlarged image WPs to be displayed next in the page turning direction is the enlarged image. It is determined that the area is on the page tail side of the WP.

  Further, as shown in FIG. 10B, when the partial enlarged image WPs from the display start position S “0” to the display area height H “56” is displayed on the display panel 2, the display start position S is displayed. The value obtained by adding the display area height H × 2 (= 120) to “112” is 100 or more. Therefore, the CPU 11 determines that the height of the non-display area on the tail side of the page is less than “56” which is the display area height H.

  Therefore, in this case, as shown in FIG. 10A, the CPU 11 sets the position “44” obtained by subtracting the display area height H “56” from “100” which is the tail of the page as the next display start position. S. In this way, in the next display, the CPU 11 displays the partial enlarged image WPs from the display start position S “44” to the tail of the page on the display panel 2. Therefore, the CPU 11 moves the partially enlarged image WPs by simple processing without performing complicated processing such as combining with part of the page display data of the next page, and as a result, displays the entire enlarged image WP. Display on panel 2.

  Referring to FIG. 9 again, when the value obtained by adding the display area height H to the display start position S is 100 or more (S102: Yes), the CPU 11 does not have an undisplayed area of the enlarged image WP on the tail side of the page. Therefore, “1” is added to the page number stored in the page number memory 13a, and the display start position S is set to “0” (S104). Thus, in the next display process (S12), the CPU 11 displays the partial enlarged image WPs from the top of the next page.

  On the other hand, when the value obtained by adding the display area height H to the display start position S is smaller than 100 (S102: No), the CPU 11 determines whether or not the following condition (Equation 1) is satisfied (S106). .

(Expression 1) (Display start position S) + (Display area height H) × 2 <100
When (Formula 1) is satisfied (S106: Yes), the CPU 11 updates the display start position S by adding the display area height H to the display start position S stored in the displayed page start memory 13b ( S108). As a result, in the next display process (S12), the CPU 11 displays the partial enlarged image WPs adjacent to the page rear end side of the partial enlarged image WPs currently displayed on the display panel 2.

  On the other hand, when (Equation 1) is not satisfied (S106: No), the CPU 11 uses the value obtained by subtracting the display area height H from “100”, which is the page tail position, as the display start position S. Update. As a result, in the next display process (S12), the CPU 11 displays partial enlarged images WPs corresponding to the display area height H from the tail of the page.

  Thus, in the page feed process (S10), the CPU 11 updates the display start position S based on the display area height H set in advance for each enlargement ratio, and moves the display start position S in the page feed direction. Move sequentially. Then, in the display process (S12), the CPU 11 displays the partial enlarged image WPs specified at the display start position S on the display panel 2, whereby the next partial enlarged image WPs positioned on the tail side of the page in the page feed direction. Is displayed.

  The page return process (S18) will be described with reference to FIG. The page return process is a process in which when the return key 7a is pressed, the CPU 11 determines the display start position S of the partially enlarged image WPs located on the page head side in the page return direction.

  The CPU 11 acquires the display start position S of the partially enlarged image WPs displayed on the display panel 2 from the displayed page start memory 13b, and determines whether or not the display start position S is 0 (the top of the page) or less. Judgment is made (S182).

  When the display start position S is 0 (S182: Yes), the CPU 11 determines that the partial enlarged image WPs corresponding to the display area height H from the top of the page is currently displayed on the display panel 2. That is, since the CPU 11 determines that there is no undisplayed area of the enlarged image WP on the leading end side of the page, the CPU 11 determines that the next image to be displayed in the page return direction is the page display data of the previous page.

  Therefore, the CPU 11 subtracts “1” from the page number stored in the page number memory 13a and sets the next display start position S to a value obtained by subtracting the display area height H from 100 (S184). Thereby, in the next display process (S12), the CPU 11 displays the partially enlarged image WPs corresponding to the display area height H from the tail of the previous page.

  On the other hand, when the display start position S is larger than “0” (S182: No), the CPU 11 leaves an undisplayed area of the enlarged image WP at the top of the page with respect to the currently displayed partial enlarged image WPs. Judge that Next, it is determined whether or not the value obtained by subtracting the display area height H from the display start position S is 0 or less (S186). When the value obtained by subtracting the display area height H from the display start position S is greater than 0 (S186: No), the value obtained by subtracting the display area height H from the display start position S is set as the next display start position S. (S190). Thereby, in the next display process (S12), the non-display area of the enlarged image WP adjacent to the top of the page is displayed on the display panel 2 as the partially enlarged image WPs.

  On the other hand, when the value obtained by subtracting the display area height H from the display start position S is 0 or less (S186: Yes), the display start position S is set to 0 (S188). Thereby, in the next display process (S12), the partially enlarged image WPs corresponding to the display area height H from the top of the page is displayed on the display panel 2.

  As described above, when the display start position S is determined in the page feed process (S10) or the page return process (S18), the partial enlarged image WPs is selected from the enlarged image WP in the next display process (S12). And displayed on the display panel 2.

  With reference to FIG. 12, the enlargement ratio changing process (S4) will be described. The enlargement ratio changing process (S4) is a process for changing the enlargement ratio of the page image P.

  First, an enlargement ratio is determined, and the determined enlargement ratio is stored in the display magnification memory 13c (S42). In the present embodiment, the display device 10 can set four stages of enlargement ratios of 100%, 133%, 200%, and 266% in order of size. Therefore, the CPU 11 performs enlargement stored in the display magnification memory 13c. The enlargement ratio of the image to be displayed next is determined according to the ratio (magnification ratio of the image displayed on the display panel 2) and the number of operations of the enlargement key 7c or the reduction key 7d.

  Next, the CPU 11 refers to the page attribute data of the page display data having the page number (page number of the currently displayed image) stored in the page number memory 13a, and the character string of the page display data is written vertically. (S44), and then it is determined whether the page display data is in the portrait mode (S46, S48). Then, the enlarged display table 12c corresponding to the page attribute data of the page display data currently displayed on the display panel 2 is referred to. Specifically, when the character string is vertically written (S44: Yes) and the page orientation is the portrait mode (S46: Yes), the enlarged display table 12c1 for the vertical writing / portrait mode (FIG. 7 ( Reference is made to a)) (S50). When the character string is vertically written (S44: Yes) and the page orientation is landscape mode (S46: No), the enlarged display table 12c2 for vertical writing / landscape mode (see FIG. 7B) is referred to (see FIG. 7B). S52).

  On the other hand, when the character string is horizontally written (S44: No) and the page is in the portrait mode (S48: Yes), the horizontal display / portrait mode enlarged display table 12c3 (FIG. 7C) is referred to (see FIG. 7C). S54). If the character string is in horizontal writing (S44: No) and the page is in landscape mode (S48: No), the horizontal display / landscape mode enlarged display table 12c4 (FIG. 7D) is referred to (S56).

  Then, the display direction and the display panel dividing method are determined in accordance with the enlarged display table 12c referred to (S58). In the CPU, the next display process (S12), the page image P or the partially enlarged image WP is displayed on the display panel 2 in accordance with the referenced enlarged display table 12c.

  The display process (S12) will be described with reference to FIG. The display process is a process of displaying an image according to the instruction on the display panel 2 when an instruction to change the enlargement ratio of the enlarged image WP is given, or when an instruction to move the image displayed on the display panel 2 is given. It is.

  First, the CPU 11 reads the page display data of the page number stored in the page number memory 13a from the memory card 6, and reads the read page display data at the page data expansion area 13d with the enlargement ratio stored in the display magnification memory 13c. The image is expanded as an enlarged image WP (see FIG. 3) (S122). If the page number and the enlargement ratio are the same as the previous display process (S12), this process can be omitted.

  Next, of the page display data expanded in the page data expansion area 13d, the CPU 11 transfers data corresponding to the partially enlarged image WPs corresponding to the display area height H from the display start position S to the VideoRAM 13e. Then, the CPU 11 generates display data corresponding to the partially enlarged image WPs based on the display direction and the display panel dividing method determined according to the enlarged display table 12c (S124). The generated display data is output to the display panel driver 16 and displayed on the display panel 2 (S126).

  With reference to FIG. 14, the display process (S12) when the enlargement ratio is 200% will be described. As shown in FIG. 14A, when the page image P is enlarged to 200%, the display panel 2 displays a division boundary D extending in parallel with the short side direction of the display panel 2, and the display panel 2 The two display areas are divided into two in the longitudinal direction, and the display area is divided into two stages arranged in the longitudinal direction. Of the two regions, the upper region is referred to as a divided region a, and the lower region is referred to as a divided region b. Then, as described with reference to FIG. 4C, the partially enlarged image WPs is displayed by being divided into two divided areas, i. FIG. 14B shows an enlarged image WP enlarged by 200%. The page display data corresponding to the enlarged image WP is expanded in the page data expansion area 13d. FIG. 14C shows partial enlarged images WPs when the display start position S is “0”.

  As shown in FIG. 14C, a part of the page display data expanded in the page data expansion area 13d is transferred and the display data is generated in the VideoRAM 13e. (The left side in FIG. 14C) is displayed in the divided area A of the display panel 2, and the half on the rear side of the line (the right side in FIG. 14C) is displayed in the divided area B of the display panel 2.

  As shown in FIG. 14C, after the partial enlarged image WPs corresponding to the display area height H “25” from the display start position S “0” is displayed on the display panel 2, the next key 7b is pressed. Then, the display area height H “25” is added to the display start position S, and the display start position S is updated. Then, as shown in FIG. 14D, the partial enlarged image WPs corresponding to the display area height H “25” from the display start position S “25” is displayed on the display panel 2 by the display process (S12). The

  With reference to FIG. 15, the display process (S12) when the enlargement ratio is 266% will be described. As shown in FIG. 15A, in the case of magnifying to 266%, the display panel 2 displays the division boundary D extending in parallel with the long side direction of the display panel 2, and the display panel 2 is short. It is divided into two in the direction, and is divided into two stages aligned in the short direction. Of the two regions, the upper region is referred to as a divided region a, and the lower region is referred to as a divided region b. Then, as described with reference to FIG. 4D, the partially enlarged image WPs is displayed by being divided into two divided areas, i.e., divided areas b and b.

  FIG. 15B shows an enlarged image WP enlarged to 266%. The page display data corresponding to the enlarged image WP is expanded in the page data expansion area 13d. FIG. 15C shows partially enlarged images WPs whose display start position S is “0”.

  The page display data expanded in the page data expansion area 13d is processed, and display data is generated in the VideoRAM 13e. As shown in FIG. 15C, the half of the partially enlarged image WPs at the head of the line (FIG. 15). (Left side in (c)) is displayed in the divided area (a) of the display panel 2, and the half on the rear side of the line (right side in FIG.

  As shown in FIG. 15C, after the partial enlarged image WPs corresponding to the display area height H “14” from the display start position S “0” is displayed on the display panel 2, the next key 7b is pressed. Then, the display area height H “14” is added to the display start position S, and the display start position S is updated. Then, as shown in FIG. 15D, the display process (S12) displays the partial enlarged image WPs for the display area height H “14” from the display start position S “14” on the display panel 2. .

  In the above description, for easy understanding of the description, the enlarged display in the case where the attribute of the page image P is the horizontal writing / portrait mode has been described. Hereinafter, with reference to FIG. 16 to FIG. 18, other attributes other than the horizontal writing portrait mode will be described.

  With reference to FIG. 16, a case where the attribute of the page display data is the vertical writing / portrait mode will be described. In this case, the partially enlarged image WPs is displayed on the display panel 2 based on the enlarged display table 12c1 (FIG. 7A).

  As shown in FIG. 16B, when the CPU 11 enlarges the page image P to 133%, the CPU 11 displays the division boundary D extending in parallel with the short side direction of the display panel 2 on the display panel 2. The longitudinal direction is divided into two stages. Then, the character string continuous in the row direction of the partially enlarged image WPs is divided into two, and arranged and displayed on the left and right of the division boundary D. Further, as illustrated in FIG. 16C, when the page image P is enlarged to 200%, the CPU 11 displays a division boundary D extending in parallel with the long side direction of the display panel 2 on the display panel 2. The display panel 2 is partitioned into two stages in the short direction. Then, the CPU 11 divides the character string continuous in the row direction of the partially enlarged image WPs into two, and arranges and displays them on the left and right of the division boundary D. As described above, in both the 133% enlargement and the 200% enlargement, the character string of one line continuous in the line direction is displayed on the display panel 2 at a time.

  A case where the page attribute data of the page display data is in the horizontal writing / landscape mode will be described with reference to FIG. In this case, the partial enlarged image WPs is displayed on the display panel 2 based on the enlarged display table 12c4 (FIG. 7D).

  As shown in FIG. 17A, when the page image P is in the landscape mode, the CPU 11 displays the page image P so that the long side direction of the page image P matches the long side direction of the display panel 2. . That is, the display panel 2 is used horizontally.

  As illustrated in FIG. 17B, when the page image P is enlarged to 133%, the CPU 11 displays a division boundary D extending in parallel with the short side direction of the display panel 2 on the display panel 2, The display panel 2 is partitioned into two stages in the long side direction. Then, the CPU 11 divides the partial enlarged image WPs into two in the row direction, and displays the divided partial enlarged images arranged above and below the division boundary D, respectively. Further, as illustrated in FIG. 17C, when the page image P is enlarged to 200%, the CPU 11 displays a division boundary D extending in parallel with the long side direction of the display panel 2 on the display panel 2. Thus, the display area of the display panel 2 is divided into two stages in the lateral direction. Further, the CPU 11 divides the partial enlarged image WPs into two in the row direction, and displays each of the divided partial enlarged images arranged above and below the division boundary D. Thus, in both the case of 133% display and 200% display, the CPU 11 displays on the display panel 2 from the beginning to the end of the character string for one line of the enlarged image WP at a time.

  A case where the page attribute data of the page image P is in the vertical writing / landscape mode will be described with reference to FIG. In this case, the partial enlarged image WPs is displayed based on the enlarged display table 12c2 (FIG. 7B).

  As shown in FIG. 18A, when the page image P is a landscape document, the CPU 11 displays the page image P so that the long side direction of the page image P matches the long side direction of the display panel 2. . That is, the display panel 2 is used horizontally.

  As shown in FIG. 18B, when enlarging the page image P to 133%, the CPU 11 rotates the partially enlarged image WPs by 90 degrees with respect to the page image P so that the row direction is the long side of the display panel 2. Display to match the direction. As shown in FIG. 18C, when the page image P is enlarged to 200%, the CPU 11 displays a division boundary D extending in parallel with the short side direction of the display panel 2 on the display panel 2. Thus, the longitudinal direction of the display panel 2 is divided into two stages. Then, the row direction of the partial enlarged image WPs is divided into two, and the CPU 11 displays the divided partial enlarged images WPs by arranging them on the left and right of the division boundary D, respectively. As shown in FIG. 18D, when the page image P is enlarged to 200%, the CPU 11 displays a division boundary D extending in parallel with the long side direction of the display panel 2 on the display panel 2. Thus, the lateral direction of the display panel 2 is divided into two stages. Then, the CPU 11 divides the row direction of the partial enlarged image WPs into two parts, and displays each of the divided partial enlarged images arranged on the left and right of the division boundary D. Thus, in any of 133%, 200%, and 266% display, the character string for one line is displayed on the display panel 2 at the same time.

  Thus, according to the display device 1 of the present embodiment, even when the page image P is enlarged, the character string for one line of the page image P is displayed on the display panel 2 simultaneously from the beginning to the end. It is possible to reduce the complexity of the document reading operation when the page image P made up of document files is enlarged.

  The display panel 2 of the first embodiment has been described as having an aspect ratio (long side length / short side length) of 1.33. Therefore, when the row direction of the page image P displayed on the display panel 2 matches the short direction of the display panel 2 (in this embodiment, the page image P is a horizontally written portrait document or a vertically written landscape document). When the page image P is enlarged to 133%, the partial enlarged image WPs is rotated by 90 degrees with respect to the page image P, and the row direction of the partial enlarged image WPs and the longitudinal direction of the display panel 2 are matched. Partial enlarged images WPs were displayed on the display panel 2. That is, since the length in the row direction of the enlarged image enlarged to 133% matches the length of the long side of the display panel 2, the display panel 2 can be obtained simply by rotating the partial enlarged image WPs by 90 degrees with respect to the page image P. By effectively using the longitudinal direction of the character string, it is possible to simultaneously display on the display panel 2 from the beginning to the other end of the character string for one line.

  Regardless of the attribute of the page image P, when the page image P is enlarged to 200%, the physical length x in the row direction of the partially enlarged image WPs (= the length of the page image P in the row direction × 2) is Therefore, even if the partially enlarged image WPs is rotated 90 degrees with respect to the page image P, a part of the character string for one line of the partially enlarged image WPs is displayed on the display panel. Protrudes from 2. Therefore, by partially dividing the partially enlarged image WPs in the row direction and displaying it in two stages, the display panel 2 can simultaneously display from the beginning to the end of the character string for one row by a simple process.

  Further, when the row direction of the page image P displayed on the display panel 2 matches the short direction of the display panel 2 (in this embodiment, the page image P is in the horizontal portrait mode or the vertical landscape mode). When the page image P is enlarged to 266%, the row direction of the partial enlarged image WPs is divided into two parts and displayed in two stages, and the partial enlarged image WPs is 90 degrees with respect to the page image P. By rotating, the row direction of the partial enlarged image WPs and the longitudinal direction of the display panel 2 are matched, and the partial enlarged images WPs divided into two are combined and displayed on the display panel 2. Therefore, the longitudinal direction of the display panel 2 can be used effectively.

  Next, the operation of the display device 1 will be described with reference to FIG. In the main control of the first embodiment described above, the CPU 11 changes the enlargement ratio of the enlarged image WP based on the depression of the enlargement key 7c or the reduction key 7d. On the other hand, in the main process of the second embodiment, the acceleration sensor 14 (see FIG. 2) detects a change in the orientation of the display panel 2 with respect to the user, and the enlarged image WP is detected based on the detection result of the acceleration sensor 14. The enlargement ratio is changed.

  In order to facilitate understanding, the CPU 11 invalidates the input to the enlargement key 7c and the reduction key 7d, and the display panel 2 has 100% or 133 during execution of the main processing of the second embodiment. Only images with an enlargement ratio of% are displayed. The page image P has an attribute of horizontal writing / portrait mode.

  In the main process of the second embodiment, first, the acceleration (gravity acceleration) detected by the acceleration sensor 14 is read (S202). The degree of inclination of the display device 1 with respect to the vertical direction can be determined from the acceleration detected by the acceleration sensor 14. Therefore, based on the detected acceleration, the CPU 11 determines whether the display panel 2 has a long side arranged in the vertical direction (hereinafter referred to as a vertically long arrangement) for the user, or the display panel 2 is long for the user. It is determined whether the sides are arranged in the horizontal direction (hereinafter referred to as landscape arrangement).

  Next, the CPU 11 determines whether or not the orientation of the display panel 2 matches the display direction (S204). Here, first, description will be made assuming that the display panel 2 is arranged vertically and the page image P with an enlargement ratio of 100% is displayed to the user. Here, the page image P is displayed in a vertically long display direction (see the enlarged display table 12c3 in FIG. 7C). Therefore, since the direction of the display panel 2 matches the display direction (S204: Yes), the key input is accepted (S212).

  When the user presses the next key 7b (S214: Yes), the display area height H corresponding to the enlargement ratio is acquired (S216), the page feed process (S218) is executed, and the display process (S226) is executed. To do. As a result, the next image in the page turning direction is displayed on the display panel 2. The page turning process (S218) is the same as the page turning process (S10) described with reference to FIG. 9, and the display process (S226) is the same as the display process (S12) described with reference to FIG. Since it is the same, detailed description is abbreviate | omitted.

  On the other hand, when the user presses the return key 7a (S220: Yes), the display area height H corresponding to the enlargement ratio is acquired (S222), the page return process (S224) is executed, and the display process (S226). Execute. As a result, the next image in the page return direction is displayed on the display panel 2. Note that the page return process (S224) is the same as the page return process (S18) described with reference to FIG.

  While the process is repeated in this manner, the display device 1 may be rotated by the user, and the display panel 2 may be placed in a landscape orientation with respect to the user. When the display panel 2 is changed from the vertically long layout to the horizontally long layout, the display middle direction and the direction of the display panel 2 do not match (S204: No). Next, it is determined whether or not the orientation of the display panel 2 is vertically long (S206). When the orientation of the display device 1 is vertically long (S206: Yes), the display middle direction is set to be vertically long, and the enlargement ratio stored in the display magnification memory 13c is set to 100% (S208). Thus, the CPU 11 displays the vertically long page image P with an enlargement ratio of 100% on the vertically long display panel 2 by the display process (S226).

  On the other hand, when the orientation of the display panel 2 is horizontally long (S206: No), the display direction is horizontally long and the enlargement ratio stored in the display magnification memory 13c is set to 133% (S210). As a result, the CPU 11 displays the partially enlarged image WPs with an enlargement ratio of 133% on the horizontally long display panel 2 by the display process (S226).

  As described above, according to the main processing (S200) of the second embodiment, the user can change the enlargement ratio of the page image P between 100% and 133% only by changing the orientation of the display panel 2. 2 can be displayed. Even when the page image P is displayed at an enlargement rate of 133%, the character string for one line is displayed on the display panel 2 from the beginning to the end at a time, so that the visibility is improved by enlarging the image. In addition, the complexity of the operation is suppressed.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications and changes can be easily made without departing from the spirit of the present invention. Can be inferred.

  For example, in this embodiment, the display panel 2 has been described as an electrophoretic panel. However, the display panel 2 is not limited to the electrophoresis method, and other display method panels such as a liquid crystal panel can also be used.

  In this embodiment, the enlargement ratio is any one of 133%, 200%, and 266%. However, these values are determined depending on the aspect ratio (1.33) of a general display. Therefore, when the aspect ratio of the display panel 2 is changed, the enlargement ratio is changed as appropriate.

  Further, the enlargement ratio may not be a fixed value, and the user may be able to set an arbitrary enlargement ratio. In that case, it is only necessary to compare the magnitude of a predetermined enlargement ratio according to the aspect ratio of the display panel 2 with an arbitrary enlargement ratio set by the user and refer to the optimum enlargement display table 12c.

  In this embodiment, the CPU 11 acquires the attribute of the page image P by referring to the page attribute data stored in the memory card 6, but the attribute of the page image P is the page display that has been read. It can also be determined by analyzing the data. In this way, the present invention can be applied even if horizontal writing / vertical writing information or portrait mode / landscape mode information is not added as page attribute data.

  Further, in the present embodiment, the case where the page image P is a document file has been described, but the present invention can also be applied when the page image P is a non-document. For example, even in the case of non-document files such as graphs and tables, there are cases where it is desired to display the predetermined direction to the user at the same time.

  In this embodiment, the division boundary D that divides the display area of the display panel 2 is displayed. By displaying the division boundary D, the arrangement of the divided partial enlarged images WPs is easy to understand, and the visibility is improved. However, the partial enlarged image WPs may be divided and displayed without displaying the division boundary D.

  The present invention can be applied to a display device including a display panel for displaying an image on a personal computer, a PDA, a mobile phone, or the like.

It is a perspective view which shows the display apparatus which is the 1st Example of this invention. It is a block diagram which shows the circuit structure of the display apparatus shown in FIG. It is a figure which shows the state which uses the display apparatus shown in FIG. 1 horizontally long. FIG. 4A is a diagram illustrating a case where the page image P is enlarged and displayed at 133%. FIG. 4B is a diagram illustrating a state in which the page image P is enlarged to 133% and rotated 90 degrees to be displayed. FIG. 4C is a diagram illustrating a state in which the page image P is enlarged to 200% and displayed. FIG. 4D is a diagram showing a state in which the page image P is enlarged and displayed at 266%. FIG. 5A is a diagram schematically showing a display area height table. FIG. 5B is a diagram showing the display area height when the enlargement ratio is 100%. FIG. 5C is a diagram showing the height of the display area when the enlargement ratio is 133%. FIG. 5D is a diagram showing the display area height when the enlargement ratio is 200%. FIG. 5E is a diagram showing the display area height when the enlargement ratio is 266%. It is a figure explaining the aspect-ratio of a display panel. FIG. 7A is an enlarged display setting table corresponding to the enlargement ratio when the document file is in the vertical writing and portrait mode. FIG. 7B is an enlarged display setting table corresponding to the enlargement ratio in the case of vertical writing and landscape mode. FIG. 7C is an enlarged display setting table corresponding to the enlargement ratio in the horizontal writing and portrait mode. FIG. 7D is a diagram for explaining an enlarged display setting table corresponding to the enlargement ratio in the horizontal writing mode and the landscape mode. It is a flowchart which shows a main process. It is a flowchart which shows a page feed process. FIG. 10A shows the relationship between the 133% enlarged image WP and the partially enlarged image WPs. In FIG. 10A, the display start position S is “44”. FIG. 10B is a diagram illustrating a case where the display start position S is “0”. It is a flowchart which shows a page return process. It is a flowchart which shows an expansion rate change process. It is a flowchart which shows a display process. FIG. 14A is a diagram for explaining a display area of a display panel that displays a horizontally written and portrait mode page image enlarged to 200%. FIG. 14B is a diagram illustrating an enlarged image WP enlarged to 200%. FIG. 14C shows the partially enlarged image WPs whose display start position S is “0”. FIG. 14D is a diagram showing partially enlarged images WPs in which the display start position S is “25” and the display area height H is “25”. FIG. 15A is a diagram showing a display area of the display panel when the horizontally written and portrait mode page image is enlarged to 266%. FIG. 15B is a diagram showing an enlarged image WP enlarged to 266%. FIG. 15C is a diagram illustrating the partially enlarged image WPs whose display start position S is “0”. FIG. 15D is a diagram showing partially enlarged images WPs in which the display start position S is “14” and the display area height H is “14”. FIG. 16A shows a page image P in vertical writing and portrait mode. FIG. 16B is a diagram showing a state in which a partially enlarged image WPs having an enlargement ratio of 133% is displayed on the display panel. FIG. 16C is a diagram showing a state in which a partially enlarged image WPs having an enlargement ratio of 200% is displayed on the display panel. FIG. 17A shows a page image P in horizontal writing and landscape mode. FIG. 17B is a diagram showing a state in which a partially enlarged image WPs having an enlargement ratio of 133% is displayed on the display panel. FIG. 17C is a diagram showing a state in which a partially enlarged image WPs with an enlargement ratio of 200% is displayed on the display panel. FIG. 18A shows a page image P in vertical writing and landscape mode. FIG. 18B is a diagram showing a state in which a partially enlarged image WPs having an enlargement ratio of 133% is displayed on the display panel. FIG. 18C is a diagram showing a state in which a partially enlarged image WPs with an enlargement ratio of 200% is displayed on the display panel. FIG. 18D is a diagram showing a state in which a partially enlarged image WPs having an enlargement ratio of 266% is displayed on the display panel. It is a flowchart which shows the main process of 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display panel 3 Control circuit 6 Memory card 11 CPU

Claims (13)

A display panel (2) having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side;
Reading means (15) for reading a rectangular original image;
A control device (10) for controlling display of the original image on the display panel,
The control means (10)
An enlarged image generating means (11) for generating an enlarged image obtained by enlarging the original image at a predetermined magnification;
The enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and a partial enlargement having an area equal to or less than the first area Image defining means (11) for defining an image;
Display control means (11, 16) for displaying the entire partial enlarged image in the display area ;
When the predetermined magnification is greater than a times and less than or equal to n times (where n is an integer of 2 or more),
The image demarcating means (11) divides the enlarged image by a first dividing line extending in parallel with the short side direction by a width of 1 / (n ² ) or less of the entire enlarged image. Define,
The display control means is a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second parting line extending in parallel with the long side direction are sequentially arranged and combined in the long side direction. And the combined image is displayed in the display area . A display panel (2) having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side;
Reading means (15) for reading a rectangular original image;
A control device (10) for controlling display of the original image on the display panel,
The control means (10)
An enlarged image generating means (11) for generating an enlarged image obtained by enlarging the original image at a predetermined magnification;
The enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and a partial enlargement having an area equal to or less than the first area Image defining means (11) for defining an image;
Display control means (11, 16) for displaying the entire partial enlarged image in the display area ;
When the predetermined magnification is larger than n times and smaller than (a · n) times (where n is an integer of 2 or more),
The image demarcating means (11) divides the enlarged image by a first dividing line extending in parallel with the short side direction by a width of 1 / ((a · n) ² ) or less of the whole. Define a partially enlarged image,
The display control means is a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second parting line extending in parallel with the long side direction are sequentially arranged and combined in the long side direction. And the combined image is rotated by 90 degrees and displayed in the display area (1). A display panel (2) having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side;
Reading means (15) for reading a rectangular original image;
A control device (10) for controlling display of the original image on the display panel,
The control means (10)
An enlarged image generating means (11) for generating an enlarged image obtained by enlarging the original image at a predetermined magnification;
The enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and a partial enlargement having an area equal to or less than the first area Image defining means (11) for defining an image;
Display control means (11, 16) for displaying the entire partial enlarged image in the display area ;
When n is an integer of 1 or more and the predetermined magnification is greater than n times and less than a · n times,
The image demarcating means (11) divides the enlarged image by a first dividing line extending in parallel with the long side direction by a width of 1 / ((2n) ² ) or less of the entire enlarged image. Define the image,
The display control means is a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second dividing line extending in parallel with the short side direction are sequentially arranged in the short side direction and combined. And the combined image is rotated by 90 degrees and displayed in the display area (1). A display panel (2) having a rectangular display area having a first area and an aspect ratio a (where a> 1) having a long side and a short side;
Reading means (15) for reading a rectangular original image;
A control device (10) for controlling display of the original image on the display panel,
The control means (10)
An enlarged image generating means (11) for generating an enlarged image obtained by enlarging the original image at a predetermined magnification;
The enlarged image is divided by a dividing line extending in parallel with one of the long side direction and the short side direction to have a predetermined width and a partial enlargement having an area equal to or less than the first area Image defining means (11) for defining an image;
Display control means (11, 16) for displaying the entire partial enlarged image in the display area ;
When n is an integer of 2 or more and the predetermined magnification is greater than (n-1) times and less than n times,
The image demarcating means (11) divides the enlarged image by a first dividing line extending in parallel with the long side direction by a width of 1 / (n ² ) or less of the entire enlarged image. Define,
The display control means is a combined image in which n provisional images obtained by dividing the partial enlarged image into n parts by a second dividing line extending in parallel with the short side direction are sequentially arranged in the short side direction and combined. And the combined image is displayed in the display area . Display means (2) having a rectangular data display area;
Reading means (15) for reading original image data corresponding to a rectangular original image;
Enlarged image generation means (11) for generating enlarged image data for displaying an enlarged image obtained by enlarging the original image, based on the original image data, according to an enlargement ratio input by a user;
Control means (10) for outputting at least part of the enlarged image data or the original image data to the display means and displaying at least part of the enlarged image or the original image on the display area in the data display area; A display device (1) comprising:
Image determining means (11) for determining a partially enlarged image obtained by dividing the enlarged image by a predetermined width in a first direction which is one of a vertical direction and a horizontal direction ;
Partition means for partitioning the data display area into n (n is an integer of 2 or more) divided display areas;
The partial enlarged image includes from one end to the other end in a second direction orthogonal to the first direction, and an area is equal to or less than the area of the data display region,
Wherein said control means outputs a portion of the enlarged image data corresponding to the partial enlarged image on the display means, be one that displays the entirety of the enlarged partial image in the data display area, the partial enlarged image Is divided into n in the second direction to generate n auxiliary images, and the n auxiliary images are sequentially assigned to the corresponding divided display areas to display the entire partial enlarged image. Display device (1) to perform. A display device (1) according to claim 5 ,
The partitioning unit matches the second direction of the original image with the short side direction of the data display area, and the physical length in the second direction of the partially enlarged image is equal to that of the data display area. The display device (1), wherein when the length in the short side direction is equal to or smaller than n, the n divided display areas are arranged in the longitudinal direction of the data display area. A display device (1) according to claim 5 ,
When the physical length in the second direction of the partial enlarged image is larger than a value obtained by multiplying the length in the short side direction of the data display area by n times, the partitioning means Partition into n divided display areas arranged in the short side direction,
The control means divides the partial enlarged image into n auxiliary images in a second direction, displays each of the n auxiliary images corresponding to the n divided regions, and displays the original image. The display device is configured to display the whole of the partial enlarged image in the data display area by rotating 90 degrees with respect to the second display so that the second direction matches the long side direction of the data display area. (1). A display device (1) according to any one of claims 5 to 7 ,
When the original image is composed of a vertically written document in which one line of characters or symbols are arranged in the vertical direction, the partial enlargement is performed with the horizontal direction of the original image as the first direction. An image is determined, and when the original image is composed of a horizontally written document in which a single line of characters or symbols are arranged in a horizontal direction, the partial enlarged image is determined with the vertical direction of the original image as the first direction. A display device (1) characterized by the above. Display means (2) having a rectangular data display area;
Reading means (15) for reading original image data corresponding to a rectangular original image;
Enlarged image generation means (11) for generating enlarged image data for displaying an enlarged image obtained by enlarging the original image, based on the original image data, according to an enlargement ratio input by a user;
Control means (10) for outputting at least part of the enlarged image data or the original image data to the display means and displaying at least part of the enlarged image or the original image on the display area in the data display area; A display device (1) comprising:
Image determining means (11) for determining a partial enlarged image obtained by dividing the enlarged image by a predetermined width in a first direction which is one of a vertical direction and a horizontal direction;
The partial enlarged image includes from one end to the other end in a second direction orthogonal to the first direction, and an area is equal to or less than the area of the data display region,
The control means outputs a part of the enlarged image data corresponding to the partial enlarged image to the display means, displays the entire partial enlarged image in the data display area ,
When the original image is composed of a vertically written document in which one line of characters or symbols are arranged in the vertical direction, the partial enlargement is performed with the horizontal direction of the original image as the first direction. An image is determined, and when the original image is composed of a horizontally written document in which a single line of characters or symbols are arranged in a horizontal direction, the partial enlarged image is determined with the vertical direction of the original image as the first direction. A display device (1) characterized by the above. A display device (1) according to claim 9 ,
When the second direction of the original image displayed in the data display area coincides with the short side direction of the data display area, the control means (10) sets the partial enlarged image to the original image. The display device (1), wherein the display device (1) is rotated by 90 degrees, and the second direction of the partially enlarged image and the long side direction of the data display region are matched with each other and displayed on the data display region. A display device (1) according to claim 10 ,
When the physical length in the second direction of the partial enlarged image is greater than the length in the short side direction of the data display area and not more than the length in the long side direction, the control means (10) The partial enlarged image is rotated by 90 degrees with respect to the original image, and the second direction of the partial enlarged image is displayed in the data display area so as to coincide with the long side direction of the data display area. Display device (1) to perform. A display device (1) according to any one of claims 8 to 11 ,
The original image data includes document data that specifies whether the original image is a vertically written document or a horizontally written document,
The display device (1), wherein the image determination means determines the partial enlarged image including one end to the other end in the second direction of the enlarged image by referring to the document data. A display device (1) according to any one of claims 8 to 11 ,
Analyzing the original image data, and having document determination means for determining whether the original image is a vertically written document or a horizontally written document,
The display device (1), wherein the image determination unit determines the partial enlarged image including one end to the other end in the second direction of the enlarged image based on a determination result by the document determination unit. .