JP2012014010A - Multi-display device and display control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain electric power consumption of a multi-display device that shows a single set of display data with a plurality of display units if the aspect ratios of video signals are inconsistent with that of the whole multi-display device.SOLUTION: In a multi-display device, when a display image is displayed expanded to the full size of a multi-display screen 10 in at least one of the vertical direction and the horizontal direction, it is determined whether or not an image-absent area arises in the other direction; in the presence of any image-absent area, it is further determined whether or not an image-absent display on which the display image does not exist is generated by altering the display position of the image; in the presence of any image-absent display, an image-absent display 12 is generated by altering the display position of the image (leftward, rightward, upward or downward) and this image-absent display is placed in a power saving mode.

Description

  The present invention relates to a multi-display device that displays one display data on a plurality of displays.

  A multi-display environment in which one display data is displayed on a plurality of displays such as 4 × 4 and 5 × 5 is known. In such a multi-display environment, when displaying one image across multiple displays, if the aspect ratio of the entire multi-display matches the aspect ratio of the image, there will be no non-display part on the display side. Display using the display screen.

  For example, if the ratio of the horizontal size and vertical size of one display is 16: 9, and the multi-display device is arranged with four vertically and four horizontally, the ratio of the video signal size to 16 horizontal and 9 vertical If so, the aspect ratio of the video signal matches the aspect ratio of the entire multi-display (see FIG. 25A).

  On the other hand, when the aspect ratio of the video signal is 4: 3, when the video signal is displayed on the multi-display device, there are portions that do not contribute to the display on the left and right (see FIG. 25B). Further, when the aspect ratio of the video signal is longer than 16: 9 (for example, a cinema scope size), there are portions that do not contribute to the display at the top and bottom of the screen (see FIG. 25C).

  In Patent Literature 1, when displaying a computer image using a plurality of displays so as to eliminate as many windows displayed across a plurality of displays connected to the computer as much as possible, the display position of the windows is adjusted and adjusted. It has been proposed to display on one display.

JP 2006-251465 A (published September 21, 2006)

  However, in the related art as described above, when the aspect ratio of the video signal does not match the aspect ratio of the entire multi-display, there are many non-display portions that do not contribute to display. In this case, there is a problem that a part of the display that uses only a part of the screen and a display that displays the video on the entire display screen consume the same power.

  Further, in Patent Document 1, when a plurality of displays are arranged side by side on a desk and these multiple displays are used as one screen, in order to avoid that a displayed window is divided into a plurality of displays, A method for shifting the position has been proposed. However, this technique is intended only to improve the visibility and operability of the user, and does not reduce the power consumption of a display that does not contribute to window display.

  The present invention has been made in view of the above problems, and in a multi-display device that displays one display data on a plurality of displays, when the aspect ratio of the video signal does not match the aspect ratio of the entire multi-display, The purpose is to reduce power consumption.

  In order to solve the above-described problems, the present invention is configured by arranging a plurality of displays in both the vertical direction and the horizontal direction, and capable of displaying one display image on a multi-display screen configured by the plurality of displays. A display device that determines whether or not a non-image display area is generated in the other direction when the display image is enlarged and displayed on the multi-display screen in at least one of a vertical direction and a horizontal direction in a full screen. Further, when the non-video display area is generated, it is determined whether or not a non-video display having no display video is generated by changing the display position of the display video, and the non-video display is generated. In this case, the display position of the display image is changed to generate the non-video display, Is characterized in that the video display displaying the power saving mode.

  When the display video is enlarged and displayed at full scale in at least one of the vertical and horizontal directions on the multi-display screen, a non-video display area occurs in the other direction (that is, the aspect ratio of the video signal is multi-display). When the display image is placed at the center of the multi-display screen as in the past, the non-image display area is divided at both ends of the screen, so that it can be displayed on the display screen where the non-image display area occurs. Video is present and consumes power similar to a full screen display.

  According to the above configuration, when the non-video display area is generated, it is determined whether or not a non-video display with no display video is generated by changing the display position of the display video, When a display display is generated, the display position of the display video is changed to generate the non-video display. By setting the non-video display thus generated in the power saving mode, it is possible to realize power saving for the entire multi-display device.

  Further, in the multi-display device, when the non-video display area is generated and the non-video display is not generated even when the display position of the display video is changed, the display video is further displayed. It is possible to reduce the size while maintaining the aspect ratio, change the display position of the reduced display image to generate the non-image display, and set the non-image display to the power saving mode.

  According to the above configuration, when the non-video display is not generated only by changing the display position of the display video, the multi-display device is generated by generating the non-video display by further reducing the display video. Overall power saving can be realized.

  The present invention is a multi-display device configured by arranging a plurality of displays in both the vertical direction and the horizontal direction, and capable of displaying one display image on a multi-display screen configured by the plurality of displays. Is determined to determine whether or not a non-image display area is generated in the other direction when the image is enlarged and displayed in at least one of the vertical direction and the horizontal direction on the multi-display screen. If it occurs, it is determined whether or not a non-video display with no display video is generated by changing the display position of the display video. If the non-video display is generated, the display of the display video is displayed. The position is changed to produce the above-mentioned no-video display, and the no-video display is A configuration in which the mode.

  Therefore, if the above-mentioned no-video display is generated by changing the display position of the above-mentioned display video, the non-video display is put into the power-saving mode to realize power saving for the entire multi-display device. There is an effect that you can.

1A and 1B show an embodiment of the present invention, in which FIG. 3A shows an example in which a display image is shifted to the left on a multi-display screen, FIG. 3B shows an example in which the display image is shifted to the right, and FIG. (D) is an example shifted downward. It is a figure which shows the screen structure of the multi-display apparatus comprised by arranging a some display in both the vertical direction (vertical direction) and a horizontal direction (horizontal direction). It is a figure which shows the connection of each display in the said multi-display apparatus. It is a block diagram which shows schematic structure of each display in the said multi-display apparatus. (A) is a display image displayed on a multi-display screen, (b) is a state in which the display image of (a) is divided into regions corresponding to the positions of the respective displays, and (c) is a display image of (a). It is a figure which shows the state currently displayed on the multi-display screen. It is a figure which shows the example which implement | achieves one image | video by enlarged display (enlarge) in a multi-display apparatus. It is a figure which shows which part of the image | video divided | segmented on each display is displayed. It is a figure which shows the setting menu in each display. It is a figure which shows the enlarged display method in each display in the case of dividing | segmenting a video signal into a horizontal direction. It is a figure which shows the enlarged display method in each display in the case of dividing | segmenting a video signal into the vertical direction. It is a block diagram which shows the signal input structure of each display in the said multi-display apparatus. It is a figure which shows the enlarged display method in an edge part display in the case of dividing | segmenting the video signal which has a non-video display area into a horizontal direction. It is a figure which shows the enlarged display method in an edge part display in the case of dividing | segmenting the video signal which has a non-video display area in the vertical direction. It is a figure which shows the enlarged display method in each display when the video signal which has a non-video display area is left-justified and divided | segmented into a horizontal direction. It is a figure which shows the enlarged display method in each display when the video signal which has a non-video display area is put near and divided | segmented to a vertical direction. 4 is a flowchart showing a procedure of display processing in each display in the multi-display device in the first embodiment. It is a flowchart which shows the display left-right shift process in the flowchart of FIG. 16, and the power saving process of a display unnecessary display. It is a flowchart which shows the display up-and-down shift process in the flowchart of FIG. 16, and the power saving process of a display unnecessary display. (A), (b) is a figure which shows the case where a display unnecessary screen does not generate | occur | produce even if an image | video is shifted, (c), (d) is the case where a display unnecessary screen is generated by reducing a display image | video. FIG. 10 is a flowchart illustrating a display processing procedure in each display in the multi-display device according to the second embodiment. FIG. 21 is a flowchart illustrating reduced display left / right shift processing and power saving processing of a display-unnecessary display in the flowchart of FIG. 20. 21 is a flowchart showing reduced display up / down shift processing and power saving processing of a display-unnecessary display in the flowchart of FIG. 20. FIG. 10 is a diagram illustrating a state in which a video signal from another input terminal is switched and displayed instead of entering the power saving mode in the third embodiment. It is a flowchart which shows a process when displaying another video signal on the display in which the display image for multiscreens does not exist. The example of a display of the conventional multi-display apparatus is shown, (a) is the case where the aspect ratio of the video signal and the aspect ratio of the entire multi-display match, and (b) is that the video signal is longer than the multi-display screen. In the case, (c) is a diagram showing a case where the video signal is horizontally longer than the multi-display screen.

[Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. First, the basic configuration of a multi-display device to which the present invention is applied will be described.

  The multi-display device according to the first embodiment is configured by arranging a plurality of displays in both the vertical direction (vertical direction) and the horizontal direction (horizontal direction). That is, this multi-display apparatus can display one video (multi-screen display video) by a plurality of displays.

  In the following description, as shown in FIG. 2, a multi-display device having 16 units of 4 columns and 4 columns is illustrated. However, in the present invention, the number of vertical and horizontal rows and the total number of units are not limited to the above example. For example, a configuration of 9 units of 3 vertical columns × 3 horizontal rows or 20 columns of 4 vertical rows × 5 horizontal rows. Other configurations, such as a table configuration, may be used. The aspect ratio of each display constituting the multi-display device may be 3: 4 or 9:16.

  In the above multi-display apparatus, each of the 16 displays constituting the multi-display apparatus is given an ID number so that each display can be identified. In FIG. 2, ID numbers “01” to “16” are assigned to 16 displays. The ID number does not need to start from 1 and need not be a continuation number, but the position of each display in the multi-display device is managed in association with each ID number. It is assumed that

  As shown in FIG. 3, each display is connected by a terminal capable of exchanging control commands such as RS232C. The terminal for exchanging the control command may be another terminal as long as it can exchange the control command, for example, a LAN terminal, and does not limit the present invention.

  Each display of “01” to “16” has a video signal input connector to which a video signal to be actually displayed is input in addition to a terminal capable of exchanging control commands such as RS232C or a LAN terminal (FIG. 4). reference). There may be a plurality of video signal input connectors, and the type of signal may be a composite video signal, a hue / chrominance signal, or a digital video signal. However, it is assumed that the same video signal is input to the same input connector from a video signal source (not shown). The input signal is selected by the scaler LSI, subjected to resolution conversion by enlargement / reduction and complementary thinning processing so as to fit the display unit, and then output to the display for display.

  Here, for example, consider a case where the video signal shown in FIG. 5A is displayed on the multi-display device shown in FIG. At this time, if the aspect ratio of the video signal is the same as the aspect ratio of the multi-display device, each display has an area corresponding to the position of each display (FIG. 5B), as shown in FIG. )) Image is displayed. In other words, each display extracts and displays the video displayed by itself from the video signal.

  Next, a mechanism for displaying one video on a plurality of displays in the multi-display device will be described.

  First, as shown in FIG. 2, an ID number for determining individual displays constituting the multi-display device is set. Specifically, for example, as shown in Table 1 below, the display IDs of the respective displays are set in correspondence with the display positions in the horizontal and vertical directions of the respective displays. In addition, as for ID numbers, a unique ID (unique ID) and a multi-control ID (display ID) may be managed separately as shown in Table 2 below.

  As a procedure for setting the ID number, for example, the ID of the first display may be set, and IDs incremented by +1 may be set for subsequent displays.

  In this manner, with the ID number set for each display, information for assigning partial display of video to each display is set. Here, as shown in FIG. 6, an example is shown in which one video is displayed in an enlarged display (enlarge) in the multi-display device.

  First, the horizontal installation number in the multi-display device is set to “enlargement magnification (horizontal)”, and the vertical installation number is set to “enlargement magnification (vertical)”. Thereby, the displayed video signal is divided according to the magnification. In each display, which part of the divided image is displayed (see FIG. 7) is set as “enlarged position (horizontal)” or “enlarged position (vertical)” (see FIG. 8). In FIG. 7, the numbers in parentheses indicate (enlarged position (horizontal), enlarged position (vertical)) of each divided image. Based on the set information, each display displays a part of the video.

  In order to display one video signal on a plurality of displays, the following example can be given as a method of dividing an input video signal into a portion used for display and a portion not used for display.

  When the video signal is divided in the horizontal direction, one line is divided by the number of horizontal displays. Specifically, as shown in FIG. 9, one line of the video signal is divided by the number of enlargement magnifications, and each display enlarges the signal in the corresponding expansion position (horizontal) range in accordance with the enlargement magnification. To display.

  Similarly, when the video signal is divided in the vertical direction, one screen is divided by the number of vertical displays. Specifically, as shown in FIG. 10, the number of lines of the video signal is divided by the number of enlargement magnifications, and each display enlarges and displays the corresponding signal at the enlargement position (vertical) in accordance with the enlargement magnification. To do.

  As a method for recognizing the aspect ratio of a video, there are an existing technique using a dedicated signal and a method using a video signal. An example of the method using a dedicated signal is a method using a dedicated signal from the S2 video signal terminal or the D terminal.

  The S2 video signal terminal is a 4 pin video terminal, and a DC voltage for identification is placed on the color signal. According to the dedicated signal from the S2 video signal terminal, it is possible to distinguish between normal (4: 3), squeeze (horizontal compression), and letterbox (16: 9 video upper and lower black bands).

  The D terminal is a 14-pin video terminal and has signal formats such as D1 (525i), D2 (525p), D3 (1080i), D4 (720p), etc., depending on the DC voltage of the three identification signal terminals. The number of effective scanning lines (1080, 720, 480 lines), scanning method (progressive, interlaced), and angle of view (16: 9, 4: 3LB, 4: 3) can be determined.

  As an example of obtaining the aspect ratio from the video signal, there is a method for obtaining the aspect ratio of the video signal by checking whether there is no video (black) in the left and right or upper and lower portions of the video signal. For example, for a video that has been compressed left and right into a 4: 3 video, the horizontal frequency can be determined from the change in the video signal. Specifically, the aspect ratio of the video area when a black band is added to the top and bottom when a 16: 9 video is stored in 4: 3, or a letterbox video that adds a left and right black band to a 4: 3 video. Can be requested.

  Usually, as shown in FIG. 11, the display generally has a plurality of video input terminals and can input a plurality of video signals simultaneously. A video signal is selected and displayed. In the case of multi-display display, since the same signal is input to each display, the numbers of the selected input terminals are the same. When the display is no longer used as a multi-display, if the display selects a signal input from a terminal other than the terminal for multi-display display, an image from the terminal is displayed.

  Here, FIGS. 9 and 10 show a case where the aspect ratio of the video signal matches the aspect ratio of the entire multi-display (the case as shown in FIG. 25A), and a non-display portion that does not contribute to display. (Non-image display area: black belt portion, etc.) does not occur. However, when the aspect ratio of the video signal does not match the aspect ratio of the entire multi-display (as shown in FIGS. 25B and 25C), a black band portion or the like occurs.

Usually, when one video signal is displayed on a plurality of displays, it is realized by the following procedure.
(1) Refer to the set horizontal magnification MH, vertical magnification MV, horizontal display position X, and vertical display position Y.
(2) Dividing the total length of the video signal (H if horizontal, V if vertical) by the respective magnification MH or MV, the length of the video signal in charge of one display is obtained. That is, it is obtained by H / MH for the horizontal line and V / MV for the vertical line.
(3) Divide the video signal by MH for horizontal lines and MV for vertical lines.
(4) From the signals divided into MH or MV signals, the horizontal display position X-th range is selected for the horizontal line, and the vertical display position Y-th range is selected for the vertical line. That is, the video signal to be displayed is 1 / MH of the horizontal signal per display in the horizontal direction (assuming that the horizontal display position is set to 1-MH and the vertical display position is set to 1-MV), and tH0 + H / horizontal. From the enlargement ratio MH × (horizontal display position X−1)) to tH0 + H / horizontal enlargement ratio MH × (horizontal display position X). On the other hand, in the vertical direction, it becomes 1 / MV of the vertical signal per display, from tV0 + V / vertical magnification MV × (vertical display position Y−1) to tV0 + V / vertical magnification MV × (vertical display position Y). .
(5) The signal selected in (4), the Xth horizontal line signal, and the Yth horizontal line are enlarged to fit the display (horizontal is MH times, vertical is MV times) and displayed on the display screen. To do.

  The above processing is illustrated in FIGS. 12 and 13. As described above, when the normal display processing is performed when the aspect ratio of the video signal does not match the aspect ratio of the entire multi-display, the display image is arranged at the center of the entire screen of the multi-display apparatus, as shown in FIG. As shown in FIG. 13, black band portions are generated on both of the divided screens on the left and right ends, or black band portions are formed on both of the divided screens on the upper and lower ends. In addition, if there is a display image even in a part of the end screen where the black band is generated, the display displaying the end screen consumes power in the same way as the display displaying the full screen. To do.

  For this reason, in the multi-display apparatus of the first embodiment, when the aspect ratio of the video signal does not match the aspect ratio of the entire multi-display, the display image is not arranged at the center of the entire screen of the multi-display apparatus, and FIG. As shown in a) to (d), display is performed in one of the left, right, up and down directions. That is, in FIG. 1A, the display image is left-justified on the multi-display screen 10 in which the displays 11 are arranged in a 4 × 4 arrangement, and the display 11 in the right end column is a non-image display display 12. Similarly, in FIG. 1B, the display 11 in the leftmost column is a no-video display 12, and in FIG. 1C, the display 11 in the bottom row is a no-video display 12. In d), the display 11 in the upper end row is a non-video display 12.

  As described above, the video signal division in the case where the display video is displayed in the left, right, top, or bottom direction of the multi-display device is shown in FIG. 14 (left-justified) and FIG. 15 (upward-justified). Show. The direction in which the display image is shifted may be followed if the priority direction is determined in advance.

  The black band (blank part) of the signal is the front part (BH1, BV1) and the rear part (BH2, BV2), which are determined from the display range obtained in (4) of the normal processing according to the determined priority. It will be shifted and displayed.

  In other words, if it is up, the signal range originally selected in (4) is shifted downward by BV1, so tV0 + V / vertical enlargement ratio MV × (vertical display position Y-1) + BV1 to tV0 + V / vertical enlargement ratio MV. × (Vertical display position Y) + BV1.

  Similarly, in the case of down-alignment, since the signal range originally selected in (4) to be displayed is shifted up by BV2, tV0 + V / vertical enlargement ratio MV × (vertical display position Y−1) −BV2 to tV0 + V / vertical enlargement. The rate is up to MV × (vertical display position Y) −BV2.

  If left-justified, the signal range originally selected in (4) is shifted backward by BH1, so H / horizontal enlargement ratio MH × (horizontal display position X−1) + BH1 to H / horizontal enlargement ratio MH × (horizontal The display position is X) + BH1.

  If it is right-justified, the signal range originally selected in (4) to be shifted is shifted forward by BH2, so H / horizontal enlargement ratio MH × (horizontal display position X-1) −BH2 to H3 / horizontal enlargement ratio MH × ( Up to the horizontal display position X) -BH2.

  Here, in the multi-display apparatus according to the first embodiment, the procedure of display processing on each display will be described with reference to the flowchart of FIG.

  First, each display constituting the multi-display device has, as an overall setting in the multi-display device, information on the configuration of the multi-display, that is, a horizontal enlargement ratio MH, a vertical enlargement ratio MV, a single display vertical size SV, and a horizontal display. Read the size SH. When these pieces of information are read out, the horizontal and vertical share amounts UH and UV in each display are obtained by the following equations (S1, S2).

UH = H / MH
UV = V / MV
However, the data width of H: 1 horizontal line
V: Number of lines on one screen Further, tH and tV which are display start positions in the horizontal and vertical directions on each display are obtained (S3). For example, in the example of FIG. 14, the display start position in the horizontal direction of the leftmost display is tH = tH0 + BH1. Here, tH0 is the horizontal start position of the input video signal, and BH1 is the data width of the black belt portion existing at the left end of the video signal. That is, since FIG. 14 shows a case where a video signal having a black belt portion on the left and right is displayed on the multi-display device while being left-justified, the display start position in the horizontal direction of the display located at the left end is It is made to coincide with the start position of the actual display image excluding. Similarly, in the example of FIG. 15, the display start position in the vertical direction of the display located at the uppermost end is tV = tV0 + BV1.

  Next, the aspect ratio of the input video is checked. The reason is to check whether it is necessary to insert black bands (non-display parts) on the top and bottom or the left and right of the video. The aspect ratio may be determined from the video signal or may be determined from the input signal of the video signal terminal, the latter being simpler.

  As an example of the latter, when a video signal is input using the S2 terminal or the D terminal, the video signal has an identification signal that directly or indirectly indicates the aspect ratio (YES in S4). It can be determined whether the aspect ratio of the video is 16: 9 or 4: 3 (S5, S7).

  If it is determined by the identification signal that the aspect ratio of the video is 16: 9 (YES in S5), the horizontal blank ratio AH and the vertical blank ratio AV are obtained by the following equations (S6).

AH = 0
AV = 1-9 × SH / (16 × SV)
If it is determined by the identification signal that the aspect ratio of the video is 4: 3 (YES in S7), the horizontal blank ratio AH and the vertical blank ratio AV are obtained by the following equations (S8).

AH = 1-4 × SV / (3 × SH)
AV = 0
If there is no identification signal in the video input signal (NO in S4), or if there is an identification signal and the video aspect ratio is neither 16: 9 nor 4: 3 (NO in S7), the following In this way, the horizontal blank ratio AH and the vertical blank ratio AV are obtained.

  First, in the vertical direction, the incorporated video signal is examined and blank lines are examined. Specifically, the number of lines BV1 (= tVB1−tV0) of the front black belt portion, the number of lines BV2 (= tVM−tVB2) of the rear black belt portion, and the number of lines V (= tVM−tV0) of one screen are obtained. (S9) Further, a vertical blank ratio AV (= (BV1 + BV2) / V) is obtained (S10).

  Further, in the horizontal direction, a one-line blank portion is examined. Specifically, the data width BH1 (= tHB1−tH0) of the front black belt portion, the data width BH2 (= tHN−tVB1) of the rear black belt portion, and the data width H (= tHN−tH0) of one horizontal line are set. Further, the horizontal blank ratio AH (= (BH1 + BH2) / H) is obtained (S12).

  When the horizontal blanking ratio AH and the vertical blanking ratio AV are obtained in this way, the magnitudes of these are compared (S13: first step). When AH> AV (YES in S13), this means that the input video is vertically longer than the entire multi-display screen, and non-displayed portions appear on the left and right of the video. Conversely, if AH <AV (NO in S13), it means that the input video is horizontally long compared to the screen of the entire multi-display, and non-displayed portions appear above and below the video.

  When AH> AV, the horizontal unnecessary screen number PH is obtained by the following equation (S14).

PH = AH × MH (MH: Horizontal magnification)
Further, it is checked whether PH ≧ 1 (S15: second step). At this time, if PH ≧ 1, it means that if the display image is shifted to the left or right in the multi-display, a display that is not displayed is generated (PH × MV displays that do not contribute to display are generated). , Where PH is an integer). For this reason, if PH ≧ 1 (YES in S15), display left / right shift processing is performed (S16: third step), and further power saving processing of a display-unnecessary display is performed (S17: third step).

  If AH <AV, the vertical unnecessary screen number PV is obtained by the following equation (S18).

PV = AV × MV (MV: Vertical magnification)
Further, it is examined whether PV ≧ 1 (S19: second step). At this time, if PV ≧ 1, if the display image is shifted up or down in the multi-display, it means that a display that is not displayed is generated (PV × MH displays that do not contribute to display are generated). , Where PV is an integer). For this reason, if PV ≧ 1 (YES in S19), display up / down shift processing is performed (S20: third step), and further power saving processing of a display-unnecessary display is performed (S21: third step).

  In the flowchart of FIG. 16, processes other than the display shift process (S16, S20) and the power saving process (S17, S21) of the display-unnecessary display may be performed in the same manner on all the displays, or any one of them. For example, the top display may perform processing, and the shift amount and direction of the screen may be instructed to another display.

  The display up / down shift processing (S16, S20) and the power saving processing (S17, S21) of the display-unnecessary display are performed on the respective displays. Here, the display left / right shift process and the display-unnecessary display power saving process will be described with reference to the flowchart of FIG.

  First, the position (X, Y) of the display where processing is performed is examined (S31). Further, the shift direction is checked (S32). Here, it is assumed that the priority direction of the shift can be set in advance by the parameter FH. In FIG. 17, left alignment is performed when FH = 1, and right alignment is performed when FH = 0.

  When FH = 1 (YES in S33), the shift direction is left justified, so the data width BH1 of the front black belt portion is checked (S34), and the value of the parameter α is set to α = BH1 (S35).

  Next, the horizontal unnecessary screen number PH is checked (S36), and it is confirmed whether PH ≦ (MH−X) is satisfied (S37). Here, if PH ≦ (MH−X), there is a video to be displayed on the display, and therefore video signal shift processing (left-justification) is performed.

  That is, in order to shift BH1 to the left in the horizontal direction, the horizontal line reading start position Hstart is set to Hstart = UH × (X−1) + α (S38), and the reading end position Hend is set to Hend = UH × X + α ( S39). Further, since no shift is required in the vertical direction, the read start position Vstart of the vertical line is set to Vstart = UV × (Y−1) (S40), and the read end position Vend is set to Vend = UV × Y (S41).

  Then, based on the horizontal line reading start position Hstart, the reading end position Hend, the vertical line reading start position Vstart, and the reading end position Vend, the display data of the above range is extracted from the input video signal (S42). (S43).

  When FH = 0 (NO in S33), the shift direction is right justified, so the data width BH2 of the rear black belt portion is checked (S44), and the value of the parameter α is set to α = (− BH2) (S45). .

  Next, the horizontal unnecessary screen number PH is checked (S46), and it is checked whether PH ≧ X is satisfied (S47). Here, if PH ≧ X is not satisfied, there is a video to be displayed on the display, and therefore video signal shift processing (right-justification) is performed.

  That is, in order to shift BH2 to the right in the horizontal direction, the horizontal line reading start position Hstart is set to Hstart = UH × (X−1) + α (S48), and the reading end position Hend is set to Hend = UH × X + α ( S49). Since no vertical shift is required, the vertical line read start position Vstart is set to Vstart = UV × (Y−1) (S50), and the read end position Vend is set to Vend = UV × Y (S51).

  Then, based on the horizontal line reading start position Hstart, the reading end position Hend, the vertical line reading start position Vstart, and the reading end position Vend, display data in the above range is extracted from the input video signal (S52). (S53).

  If PH ≦ (MH−X) is not satisfied in S37, or if PH ≧ X is satisfied in S47, there is no video to be displayed on this display. In this case, the display is set to a power saving mode such as turning off the display (S54).

  Next, the display up / down shift process and the display-unnecessary display power saving process will be described with reference to the flowchart of FIG.

  First, the position (X, Y) of the display where processing is performed is examined (S61). Further, the shift direction is checked (S62). Here, it is assumed that the priority direction of the shift can be set in advance by the parameter FV. In FIG. 18, the upper right is set when FV = 1, and the right side is set when FV = 0.

  If FV = 1 (YES in S63), the shift direction is upward, so the number of lines BV1 in the front black belt portion is checked (S64), and the value of the parameter β is set to β = BV1 (S65).

  Next, the number of unnecessary vertical screens PV is checked (S66), and it is confirmed whether PV ≦ (MV−Y) is satisfied (S67). Here, if PV ≦ (MV−Y), there is an image to be displayed on the display, and therefore a video signal shift process (up-alignment) is performed.

  That is, in order to shift BV1 upward in the vertical direction, the read start position Vstart of the vertical line is set to Vstart = UV × (Y−1) + β (S68), and the read end position Vend is set to Vend = UV × Y + beta. (S69). Since no horizontal shift is required, the horizontal line read start position Hstart is set to Hstart = UH × (X−1) (S70), and the read end position Hend is set to Hend = UH × X (S71).

  Then, based on the horizontal line reading start position Hstart, reading end position Hend, vertical line reading start position Vstart, and reading end position Vend, the display data in the above range is extracted from the input video signal (S72). (S73).

  When FV = 0 (NO in S63), the shift direction is downward, so the number of lines BV2 in the rear black belt portion is checked (S74), and the value of the parameter β is set to β = (− BV2) (S75). ).

  Next, the number of unnecessary vertical screens PV is checked (S76), and it is checked whether PV ≧ Y is satisfied (S77). Here, if PV ≧ Y is not satisfied, there is a video to be displayed on the display, and therefore a video signal shift process (lowering) is performed.

  That is, in order to shift BV2 downward in the vertical direction, the vertical line reading start position Vstart is set to Vstart = UV × (Y−1) + β (S78), and the reading end position Vend is set to Vend = UV × Y + β ( S79). Since no horizontal shift is required, the horizontal line read start position Hstart is set to Hstart = UH × (X−1) (S80), and the read end position Hend is set to Hend = UH × X (S81).

  Then, based on the horizontal line reading start position Hstart, reading end position Hend, and vertical line reading start position Vstart and reading end position Vend, the display data in the above range is extracted from the input video signal (S82). (S83).

  If PV ≦ (MV−Y) is not satisfied in S67, or if PV ≧ Y is satisfied in S77, there is no video to be displayed on this display. In this case, the display is set to a power saving mode such as turning off the display (S84).

[Embodiment 2]
In the first embodiment, it is determined whether or not a display-unnecessary screen is generated by shifting the display video, and the shift process is performed when the display-unnecessary screen is generated. That is, as shown in FIGS. 19A and 19B, the shift process is not performed when a display-unnecessary screen does not occur even when the video is shifted. FIG. 19A shows a case where a display-unnecessary screen is not generated even by a left shift, and FIG. 19B shows a case where a display-unnecessary screen is not generated even by an upward shift.

  On the other hand, in the second embodiment, when a display unnecessary screen does not occur just by shifting the display image, the display image is further reduced to generate a display unnecessary screen. For example, in FIG. 19C, the display in the rightmost column is a display-unnecessary screen by left shift processing and reduction processing. In FIG. 19D, the display in the lowermost row is used as a display-unnecessary screen by the upshift process and the reduction process.

  In the multi-display device of the second embodiment, the display processing procedure on each display will be described with reference to the flowchart of FIG. However, since the process shown in the flowchart of FIG. 20 has the same process as the process shown in the flowchart of FIG. 16, the same process is given the same step number as in FIG.

  If the input video is vertically longer than the entire multi-display screen and PH <1 in S15, a display that is not displayed does not occur just by shifting the display video left or right on the multi-display. That is, none of the displays can be set to the power saving mode. In the second embodiment, in such a case, display image reduction processing is performed.

  First, the number of unnecessary horizontal screens PH is set to PH = 1 (S91). Furthermore, the amount of signals allocated to one display is changed from UH, UV to UUH, UUV based on the following formula (S92, S93).

UUH = (H− (BH1 + BH2)) / (MH−1)
UUV = (UUH / UH) × UV
In other words, UUH is UH> UUH, and the portion excluding the black belt portion (BH1 and BH2) of the horizontal video signal is divided by the number obtained by subtracting 1 from the horizontal magnification MH (= equal to the number of horizontal displays). It is. UUV corrects only UUH / UH in order to maintain the aspect ratio of the displayed video.

  Thus, when PH, UUH, and UUV are set, reduced display left and right shift processing is performed using these (S94: fourth step), and further, power saving processing for a display-unnecessary display is performed (S95: fourth step). ).

  If the input video is horizontally long compared to the screen of the entire multi-display and PV <1 in S19, the following processing is similarly performed.

  First, the number of unnecessary vertical screens PV is set to PV = 1 (S96). Furthermore, the amount of signals allocated to one display is changed from UH, UV to UUH, UUV based on the following formula (S97, S98).

UUV = (V− (BV1 + BV2)) / (MV−1)
UUH = (UUV / UV) × UH
Thus, when PH, UUH, and UUV are set, reduced display up / down shift processing is performed using these (S99: fourth step), and further, power saving processing of a display-unnecessary display is performed (S100: fourth step). ).

  Here, the reduced display left / right shift process and the display-unnecessary display power saving process will be described with reference to the flowchart of FIG. Note that the flowchart shown in FIG. 21 performs almost the same processing as the flowchart shown in FIG.

  That is, in the flowchart of FIG. 21, the processes of S111 to S114 are performed instead of the processes of S38 to S41 of FIG. 17, and the processes of S115 to S118 are performed instead of the processes of S48 to S51. In other words, UUH and UUV are used instead of UH and UV in obtaining the horizontal line read start position Hstart, read end position Hend, and vertical line read start position Vstart and read end position Vend.

  FIG. 22 shows the reduced display up / down shift process and the display-unnecessary display power saving process. In the flowchart of FIG. 22, the processes of S121 to S124 are performed instead of the processes of S68 to S71 of FIG. 18, and the processes of S125 to S128 are performed instead of the processes of S78 to S81. That is, in the same manner as the relationship between FIG. 17 and FIG. 21, the horizontal line reading start position Hstart, the reading end position Hend, the vertical line reading start position Vstart, and the reading end position Vend are obtained instead of UH and UV. The only difference is that UUH and UUV are used.

[Embodiment 3]
In the first or second embodiment, a display that has no video to be displayed as a result of shifting the display video automatically enters the power saving or standby mode, or the power saving or standby mode is controlled by control from another display. It may be. In a display in the power saving mode, for example, power consumption can be reduced by turning off the power.

  However, the display in which the multi-screen display video (display video displayed on the entire multi-display) does not exist due to the shift process in the multi-display does not necessarily need to be in the power saving mode. Other input signals can be displayed. In other words, there is a multi-display compatible multi-display that does not save power when there is an input signal other than the video displayed on the multi-display, and displays the input video signal without power, and saves power when there is no input. It is feasible. Such a display state is shown in FIG.

  The processing in this case is shown in the flowchart of FIG. That is, it is determined whether or not there is another video input in each display in which no multi-screen display video exists (S131). If there is another video input, the video input is switched (S132), and the switched video input is displayed alone (S133). If there is no other video input, the display is set to the power saving mode (S144).

  In addition, if the aspect ratio of the multi-screen display video changes and a video signal is displayed on the display that has been in the power saving mode, it is displayed again using the signal from the multi-screen video signal input. In other words, it is possible to cope with dynamic changes in the multi-display video signal.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be used in a multi-display device that displays one display data on a plurality of displays.

10 Multi-display screen 11 Display 12 No video display

Claims (4)

A multi-display device configured by arranging a plurality of displays in both vertical and horizontal directions, and capable of displaying one display image on a multi-display screen configured by the plurality of displays,
Determining whether or not a non-video display area is generated in the other direction when the display image is enlarged and displayed in a full screen in at least one of the vertical direction and the horizontal direction in the multi-display screen;
Further, when the non-video display area occurs, it is determined whether or not a non-video display with no display video is generated by changing the display position of the display video,
When the non-video display is generated, the multi-display device is characterized in that the display position of the display video is changed to generate the non-video display, and the non-video display is in a power saving mode. If the no-video display area occurs and the no-video display does not occur even if the display position of the display video is changed,
Further, the display image is reduced while maintaining the aspect ratio, the display position of the reduced display image is changed to generate the no-image display display, and the no-image display display is set to a power saving mode. The multi-display apparatus according to claim 1. A display control method for a multi-display device that is configured by arranging a plurality of displays in both a vertical direction and a horizontal direction, and capable of displaying one display image on a multi-display screen configured by the plurality of displays,
A first step of determining whether or not a non-video display area is generated in the other direction when the display video is enlarged and displayed in a full screen in at least one of the vertical direction and the horizontal direction on the multi-display screen;
Furthermore, when the non-video display area occurs, a second step of determining whether or not a non-video display without a display video occurs by changing the display position of the display video;
When the non-video display is generated, the display step of the display video is changed to generate the non-video display, and the non-video display is set to a power saving mode. A display control method for a multi-display device. In the second step, when the non-video display area is generated and the non-video display is not generated even when the display position of the display video is changed,
Further, the display image is reduced while maintaining the aspect ratio, the display position of the reduced display image is changed to generate the no-image display display, and the no-image display display is set to the power saving mode. 4. The display control method for a multi-display device according to claim 3, further comprising four steps.

Images