JP2013238648A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that effectively use a drawing range of an image display surface irrespective of the drawing amount of the image display surface.SOLUTION: A display device includes an image display unit 10 that has an image display surface configured to be taken up freely, and display control means 24 for displaying a content on the image display surface drawn from the image display unit 10. The display control means 24 determines vertical arrangement or lateral arrangement, and display size of the content to be displayed, so as to improve display density on the drawn image display surface while maintaining the aspect ratio of the content according to the drawing amount of the image display surface.

Description

  The present invention relates to a display device.

  In a roll-up display that is rolled up into a cylindrical shape and rolled up when not in use, a technique for reducing (or enlarging) the display image so as to fit the display image on an image display surface drawn out during use is known (Patent Literature). 1).

JP-A-2005-321702

  In the prior art, since the vertical / horizontal arrangement of the display video is reduced (or enlarged), the extracted area of the image display surface cannot be effectively used.

  The present invention is applied to a display device including an image display unit configured so that the image display surface can be freely wound, and display control means for displaying content on the image display surface drawn from the image display unit. The display control means is configured to vertically or horizontally arrange the content to be displayed so as to increase the display density on the drawn image display surface while maintaining the aspect ratio of the content according to the drawing amount of the image display surface. The display size is determined.

  In the display device according to the present invention, the drawing range of the image display surface can be effectively used regardless of the drawing amount of the image display surface.

1 is a perspective view illustrating an image display device according to an embodiment of the invention. It is a figure explaining the relationship between the drawing amount of a display part, and the image displayed. It is a figure explaining the relationship between the drawing amount of a display part, and the image displayed. It is a figure explaining the relationship between the drawing amount of a display part, and the image displayed. It is a figure explaining the principal part structure of an image display apparatus. It is a flowchart explaining the flow of the display control process which a control part performs. It is a flowchart explaining the detail of the process which determines display size and arrangement | positioning. It is a figure which illustrates the display of the modification 1. It is a figure explaining the relationship between the drawing-out amount in the modification 2, and the image displayed. It is a figure explaining the relationship between the drawing-out amount in the modification 2, and the image displayed.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating an image display device 1 according to an embodiment of the invention. The image display device 1 is a so-called roll-up display configured to wind up the sheet-like display unit 10. The display unit 10 is pulled out from the housing 20 in the direction of the arrow by the user, and the image 11 is displayed on the pulled-out display surface of the display unit 10. The image 11 may be a moving image or a still image.

  The display unit 10 is configured by a flexible display that can be bent. The casing 20 incorporates a winding mechanism (not shown). When a winding button as one of the operation members 21 is pressed, the winding mechanism automatically winds the display unit 10 into the housing 20. The take-up mechanism has a ratchet mechanism (not shown), and maintains the pull-out amount of the display unit 10 when the take-up button is not pressed. Thus, the user can use the display unit 10 by pulling it out of the housing 20 by an arbitrary length.

  2 to 4 are diagrams for explaining the relationship between the drawing amount of the display unit 10 and the image 11 to be displayed. In FIG. 2, X is a direction in which the display unit 10 is pulled out from the housing 20. A direction orthogonal to the pulling-out direction X (that is, the width direction of the display unit 10) is Y. Then, the effective display range in the X direction obtained by subtracting a predetermined allowance Δx from the amount of drawing of the display unit 10 in the X direction is defined as Wx. The effective display range in the Y direction is Wy. An area indicated by Wx × Wy is set as an effective display area.

  The image display device 1 is configured to be able to display any aspect ratio of the long side and the short side of the image of 4: 3, 3: 2, and 16: 9. In the present embodiment, A case where an image having an aspect ratio of 16: 9 is displayed will be described as an example.

In the image display device 1, when the display unit 10 is pulled out to a state satisfying the following expression (1) by the user, the image display device 1 displays the image 11 on the display surface of the display unit 10 as illustrated in FIG. 2. To do.
Wx = Wy × 9/16 (1)
However, Wx is an effective display range in the X direction, and Wy is an effective display range in the Y direction.

The image display device 1 in the case where the display unit 10 is further pulled out by the user and the drawing amount is in a range satisfying the following expression (2), the image 11 having the same size as the image 11 displayed in the case of FIG. 10 display screens. As illustrated in FIG. 3, the display position of the image 11 is substantially the center of the effective display range Wx in the X direction.
Wy × 9/16 <Wx <Wy × 16/9 (2)

When the display unit 10 is pulled out to a state satisfying the following expression (3) by the user, as illustrated in FIG. 4, the image display device 1 changes (enlarges) the size as compared with the case of FIG. The image 11 whose degree of arrangement has been changed is displayed on the display surface of the display unit 10.
Wx = Wy × 16/9 (3)

  FIG. 5 is a diagram for explaining a main configuration of the image display device 1 described above. Each block illustrated in FIG. 5 is mounted in the housing 20 (FIG. 1). In FIG. 5, the control unit 24 executes a control program using the RAM 22 as a work area, and controls display by the display unit 10. Specifically, a display start instruction and a display end instruction are sent to the display unit 10 and an image signal which is a display source is sent.

  The control unit 24 further determines the size of the image to be displayed, the arrangement of the images, and the display position in the effective display range according to the pulling amount of the display unit 10, and based on the operation signal received by the operation member 21, Color temperature adjustment, contrast adjustment, brightness adjustment, and the like of the image signal transmitted to the display unit 10 are performed. The display unit 10 reproduces and displays an image based on the image signal transmitted from the control unit 24.

  The photo encoder 26 detects, for example, a pattern (not shown) provided at a predetermined interval on the edge of the display unit 10, and transmits a detection signal to the control unit 24. The control unit 24 calculates the drawing amount of the display unit 10 based on the number of patterns detected when the display unit 10 is drawn.

  The image input unit 25 includes a wireless communication circuit and a data reading circuit, and receives image data received from an external device via wireless communication, image data read from a memory card installed in a memory card slot (not shown), or not shown. The image data received from the external device is transmitted to the control unit 24 via the cable connected to the communication connector. The control unit 24 causes the display unit 10 to display a reproduced image based on image data instructed in advance by an operation from the operation member 21.

  The flash memory 23 stores programs executed by the control unit 24, data necessary for execution processing, and the like. The contents of the program and data stored in the flash memory 23 can be added and changed by an instruction from the control unit 24. The RAM 22 is used as a work area by the control unit 24 as described above. The attitude sensor 27 detects the direction of gravity, for example, and transmits a detection signal to the control unit 24.

  Since the present embodiment is characterized by display control for causing the display unit 10 to perform the display illustrated in FIGS. 2 to 4 in the image display apparatus 1, the following description will be focused on this point.

<Display control processing>
FIG. 6 is a flowchart for explaining the flow of display control processing executed by the control unit 24. When the display-on operation signal is input from the operation member 21, the control unit 24 activates the process illustrated in FIG. 6. In step S11, the control unit 24 reads content data to be displayed from the image input unit 25 and proceeds to step S12. The content data input via the image input unit 25 may be stored in the flash memory 23 in advance and the content data may be read from the flash memory 23.

  In step S12, the control unit 24 detects the aspect ratio B of the image read as content data, and proceeds to step S13. In this description, B = (length of long side of image) / (length of short side of image). In step S13, the control unit 24 detects the aspect ratio A of the display area based on the drawing amount of the display unit 10, and proceeds to step S14. In this description, A = (effective display range Wy) / (effective display range Wx). As described above, the effective display range Wx in the X direction is obtained by subtracting the predetermined holding allowance Δx from the pull-out amount of the display unit 10.

  In step S14, the control unit 24 detects the orientation (posture) of the image display device 1, and proceeds to step S15. This is to determine which direction of the image processing apparatus 1 corresponds to the direction of gravity.

  In step S15, the control unit 24 determines the size of the image to be reproduced and displayed on the display unit 10, and the vertical / horizontal arrangement of the image, and proceeds to step S16. Details of this determination process will be described later. In step S16, the control unit 24 determines the display position of the reproduced image on the display surface of the display unit 10, and proceeds to step S17. The display position of the reproduced image is represented by the center position of the image 11 (FIG. 3), for example. As illustrated in FIG. 3, when the image 11 is displayed at substantially the center of the effective display range Wx, Wx / 2 is set as the display position.

  In step S17, the control unit 24 performs image resizing processing to the size determined in step S15, and proceeds to step S18. In step S18, the control unit 24 sends the resized image data to the display unit 10, and instructs the determined display position to reproduce the image in the determined arrangement, and the process proceeds to step S19.

  In step S19, the control unit 24 determines whether an end operation has been performed. When the display off operation signal is input from the operation member 21, the control unit 24 makes a positive determination in step S19 and proceeds to step S20. When the display off operation signal is not input from the operation member 21, the control unit 24 makes a negative determination in step S19. Then, the process proceeds to step S21.

  In step S <b> 20, the control unit 24 instructs the display unit 10 to turn off the display, and ends the process illustrated in FIG. 6. On the other hand, in step S21 that proceeds with a negative determination in step S19, the control unit 24 determines whether or not a display source switching operation has been performed. When the display source switching signal is input from the operation member 21, the control unit 24 makes a positive determination in step S21 and returns to step S11. When returning to step S11, processing for controlling the display size of the image and the arrangement of the image in accordance with the change in the drawing amount of the display unit 10 and the orientation of the image display device 1 after reading the image data to be newly displayed. repeat.

  When the display source switching signal is not input from the operation member 21, the control unit 24 makes a negative determination in step S21 and returns to step S13. When returning to step S13, the process of controlling the display size of the image and the arrangement of the image according to the change in the drawing amount of the display unit 10 and the orientation of the image display device 1 is repeated while continuing to display and display the image data. .

<Process for determining display size and arrangement>
FIG. 7 is a flowchart for explaining the details of the processing in step S15. In step S51, the control unit 24 determines whether A> B is satisfied for the aspect ratio A and the aspect ratio B. If A> B is satisfied, the control unit 24 makes a positive determination in step S51 and proceeds to step S52. If A> B is not satisfied, the control unit 24 makes a negative determination in step S51 and proceeds to step S53. The case where A> B is satisfied corresponds to a case where the display unit 10 is not pulled out until a state satisfying the above expression (1) is satisfied. In step S <b> 52, the control unit 24 determines to reduce (change the size) the display based on the image data, and ends the process of FIG. 7. When it is determined to display the image in a reduced size (changed size), the control unit 24 determines the length in the short side direction of the image as Wx and the length in the long side direction of the image as Wx × B. In addition, when the reproduced image is a horizontally long image, the control unit 24 normally determines the horizontal arrangement in which the lower side of the image is the positive side in the X direction. However, when gravity is detected on the negative side in the X direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the X direction (the top and bottom of the image is inverted). When the reproduced image is a vertically long image, it is usually determined to be vertically arranged with the lower side of the image on the positive side in the Y direction. However, when gravity is detected on the negative side in the Y direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the Y direction (the top and bottom of the image is inverted).

  In step S <b> 53, the control unit 24 determines whether A = B is satisfied for the aspect ratio A and the aspect ratio B. If A = B is satisfied, the control unit 24 makes a positive determination in step S53 and proceeds to step S54. If A = B is not satisfied, the control unit 24 makes a negative determination in step S53 and proceeds to step S55. The case where A = B is satisfied corresponds to a state satisfying the above expression (1).

  In step S54, the control unit 24 determines the length in the long side direction of the image as Wy and the length in the short side direction of the image as Wx for the display size to be reproduced and displayed. Further, when the reproduced image is a horizontally long image, the control unit 24 normally determines the horizontal arrangement in which the lower side of the image is the positive side in the X direction (FIG. 2). However, when gravity is detected on the negative side in the X direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the X direction (the top and bottom of the image is inverted). When the reproduced image is a vertically long image, it is usually determined to be vertically arranged with the lower side of the image on the positive side in the Y direction. However, when gravity is detected on the negative side in the Y direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the Y direction (the top and bottom of the image is inverted). If the control part 24 determines in this way, the process by FIG. 7 will be complete | finished.

  In step S55, the control unit 24 determines whether B> A> (1 / B) is satisfied for the aspect ratio A and the aspect ratio B. If B> A> (1 / B) is satisfied, the control unit 24 makes an affirmative determination in step S55 and proceeds to step S56. If B> A> (1 / B) is not satisfied, the control unit 24 performs step S55. A negative determination is made and processing proceeds to step S57. The fact that B> A> (1 / B) is satisfied corresponds to a state satisfying the above expression (2).

  In step S56, the control unit 24 determines the display size to be reproduced and displayed in the same manner as in step S54. Further, the control unit 24 determines the arrangement of the images in the same manner as in step S54, and ends the process of FIG.

  In step S57, the control unit 24 determines whether A = (1 / B) is satisfied for the aspect ratio A and the aspect ratio B. When A = (1 / B) is satisfied, the control unit 24 makes a positive determination in step S57 and proceeds to step S58. When A = (1 / B) is not satisfied, the control unit 24 makes a negative determination in step S57. Proceed to step S59. The establishment of A = (1 / B) corresponds to a state satisfying the above expression (3).

  In step S58, for the display size to be reproduced and displayed, the control unit 24 determines the length in the long side direction of the image as Wx and the length in the short side direction of the image as Wy. Further, when the reproduced image is a horizontally long image, the control unit 24 normally determines the horizontal arrangement with the lower side of the image being the positive side in the Y direction (FIG. 4). However, when gravity is detected on the negative side in the Y direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the Y direction (the top and bottom of the image is inverted). When the reproduced image is a vertically long image, it is usually determined to be vertically arranged with the lower side of the image as the positive side in the X direction. However, when gravity is detected on the negative side in the X direction by the attitude sensor 27, the direction below the image is determined to be the negative side in the X direction (the top and bottom of the image is inverted). If the control part 24 determines in this way, the process by FIG. 7 will be complete | finished.

  In step S59, the control unit 24 determines the display size to be reproduced and displayed in the same manner as in step S58. Further, the control unit 24 determines the image arrangement in the same manner as in step S58, and ends the process of FIG.

According to the embodiment described above, the following operational effects can be obtained.
(1) The image display device 1 includes a display unit 10 configured so that the image display surface can be wound up, and a control unit 24 that displays the image 11 on the image display surface drawn from the display unit 10. The unit 24 arranges the image 11 to be displayed vertically or so as to increase the display density on the drawn image display surface while maintaining the aspect ratio B of the image 11 according to the drawing amount (≈Wx) of the image display surface. The horizontal layout and display size were determined. As a result, the area used for image display in the drawn image display surface is increased regardless of the drawing amount of the image display surface (that is, the display density is increased by reducing the blank space that does not contribute to the image display). The drawer area on the display surface can be used effectively.

(2) In the image display device 1, the control unit 24 that detects the aspect ratio A of the display area (Wx × Wy) of the extracted image display surface, the control unit 24 that detects the aspect ratio B of the image 11, The control unit 24 determines the vertical arrangement or the horizontal arrangement of the image 11 to be displayed and the display size based on the comparison result of the aspect ratios A and B. Even so, the drawing range of the image display surface can be used effectively regardless of the value of the aspect ratio B of the image 11.

(3) In the image display device 1, the control unit 24 associates the short side of the image 11 with the short side of the display area (Wx × Wy), and associates the long side of the image 11 with the long side of the display area. In addition, since the vertical or horizontal arrangement and the display size of the image 11 to be displayed are determined, the image display surface is displayed regardless of whether the image 11 is a horizontally long image or a vertically long image, regardless of the amount of drawing on the image display surface. The drawer range can be used effectively.

(4) In the image display apparatus 1, the control unit 24 determines that the short side of the image 11 is drawn in the drawing direction X of the image display surface when B ≧ A> (1 / B) when determining the vertical arrangement or the horizontal arrangement. In the case of A ≦ (1 / B), the long side of the image 11 is made to correspond to the drawing direction X of the image display surface. Therefore, regardless of the drawing amount of the image display surface and the aspect ratio of the image 11, the image The drawer area on the display surface can be used effectively.

(5) The image display device 1 further includes a posture sensor 27 that detects the direction of gravity, and the control unit 24 reversely displays the content when the determined top of the content display is opposite to the detected gravity direction. Because of this, you can avoid displaying upside down.

(Modification 1)
When the control unit 24 decides to reduce the display in step S52 (FIG. 7) described above, the effective display area of the display unit 10 may be displayed in gray (shaded line 12) as exemplified in FIG. Good. Although the image is not reproduced and displayed, the user can be informed that the display of the display unit 10 is turned on by displaying the image in gray.

(Modification 2)
The above-described range in which the drawing amount of the display unit 10 satisfies the above equation (2) may be further subdivided. As illustrated in FIG. 9, the control unit 24 according to the first modification example, when the pulling amount of the display unit 10 by the user is longer than the state illustrated in FIG. 2 and satisfies the following expression (4), as illustrated in FIG. Two reproduced images are displayed side by side with the image size changed (enlarged) compared to the case and the 90 ° arrangement changed. Here, regarding the display size of one image, the length in the short side direction of the image is approximately Wy / 2, and the length in the long side direction of the image is Wx. Note that the display position of the two images 11a and 11b is approximately the center of the effective display range Wx in the X direction.
Wy × 8/9 <Wx <Wy × 9/8 (4)

Further, the control unit 24, as shown in FIG. 10, is compared with the case of FIG. 9 when the user pulls out the display unit 10 longer than the state illustrated in FIG. The image size is changed (enlarged) and two reproduced images whose arrangements are changed by 90 degrees are displayed side by side. Here, regarding the display size of one image, the length in the short side direction of the image is approximately Wx / 2, and the length in the long side direction of the image is Wy. The display position of the two images 11a and 11b is substantially the center of the effective display range Wx in the X direction.
Wy × 9/8 <Wx <Wy × 16/9 (5)

  According to the second modification, the area used for content display is increased regardless of the amount of drawing on the image display surface, and the drawing range on the image display surface can be used effectively.

(Modification 3)
In the above-described steps S54, S56, S58, and S59, an example in which the image layout is determined each time has been described. Instead of this, it is possible to switch between a state in which the arrangement is fixed so that the long side of the image always corresponds to Wy (or Wx) and a state in which the arrangement of the image is determined each time in steps S54, S56, S58, and S59. You may comprise.

  The above description is merely an example, and is not limited to the configuration of the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Image display apparatus 10 ... Display part 11 ... Image 20 ... Case 21 ... Operation member 23 ... Flash memory 24 ... Control part 25 ... Image input part 26 ... Photo encoder 27 ... Attitude sensor

Claims (6)

An image display unit configured so that the image display surface can be freely wound;
Display control means for displaying content on the image display surface drawn from the image display unit,
The display control means is configured to vertically or horizontally arrange the content to be displayed so as to increase the display density on the drawn image display surface while maintaining the aspect ratio of the content according to the drawing amount of the image display surface. A display device characterized by determining an arrangement and a display size. The display device according to claim 1,
First detection means for detecting an aspect ratio A of a display area of the image display surface that has been pulled out;
Second detecting means for detecting an aspect ratio B of the content,
The display control unit determines a vertical arrangement or a horizontal arrangement of the content to be displayed and a display size based on a comparison result of aspect ratios A and B. The display device according to claim 2,
The display control means vertically or horizontally arranges the content to be displayed so that the short side of the content corresponds to the short side of the display region and the long side of the content corresponds to the long side of the display region. And a display size are determined. The display device according to claim 3,
The display control means, when determining the vertical arrangement or horizontal arrangement,
When B ≧ A> (1 / B), the short side of the content is made to correspond to the drawing direction of the image display surface,
A display device characterized in that when A ≦ (1 / B), the long side of the content corresponds to the drawing direction of the image display surface. The display device according to claim 4,
A detection sensor for detecting the direction of gravity of the display device;
The display control means, when the determined content display top and bottom are opposite to the detected direction of gravity, reversely display the content. The display device according to claim 2,
The display control means displays the two contents side by side on the extracted image display surface, associates the long side of the content with the short side of the display area, and sets the two contents on the long side of the display area. A display device characterized by corresponding to the short side of the arranged contents.