JP2007235335A - Display unit with rotary mechanism, and method for correcting distortion of video signal in display unit with rotary mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a viewer with a natural video image even if a display is rotated. <P>SOLUTION: When the display unit is installed or moved at first, a viewer rotates and adjusts a display 17 to an optimal position and then sets an initial angle from an operating section 15. When the viewer rotates the display 17 next, a rotation angle detecting section 19 detects its rotation angle and outputs the detected rotation angle to a distortion correction coefficient calculating section 14. The distortion correction coefficient calculating section 14 calculates an optimal distortion correction coefficient depending on the rotation angle of the display 17 detected at the rotation angle detecting section 19 and outputs the coefficient to a distortion correcting section 13. The distortion correcting section 13 performs distortion correction processing of a video signal inputted from a video processing section 12 by utilizing the distortion correction coefficient calculated in the distortion correction coefficient calculating section 14 before a video image is outputted and displayed on the display 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device with a rotation mechanism that automatically corrects an image that appears distorted during rotation on a display having a screen rotation mechanism, and a video signal distortion correction method in the display device with a rotation mechanism.

Some display devices such as TVs have a display screen rotation mechanism, and can be adjusted to an optimum angle with respect to the viewing location. Conventionally, TVs equipped with such a rotating mechanism have been limited to small to medium-sized displays. However, thin-screen TVs such as liquid crystal TVs and plasma TVs have been developed for large displays. Increasing (see, for example, Patent Document 1).
JP 2004-112234 A

  However, in the above-described prior art, when the video signal displayed on the display is viewed by rotating the display without changing the viewing position, the viewer sees the video signal from an oblique direction, and the screen is displayed on the display screen. There is a problem that the displayed image looks distorted and becomes unnatural.

  In particular, this becomes more noticeable as the display screen becomes larger, and the viewer feels uncomfortable.

  Accordingly, an object of the present invention is to provide a display device with a rotation mechanism that can provide a viewer with a natural image even if the display is rotated, and a method for correcting distortion of a video signal in the display device with a rotation mechanism. And

  To achieve the above object, a display device with a rotation mechanism according to the present invention includes a rotation mechanism capable of adjusting the angle of a display for displaying a video signal, and a viewing distance setting for storing a viewing distance between the display and the viewer. And a rotation angle detection unit that detects a rotation angle of the display with reference to a rotation angle in an initial state of the display when the angle of the display changes, and the display of the display detected by the rotation angle detection unit Based on the rotation angle and the viewing distance, a distortion correction coefficient calculating unit that calculates a distortion correction coefficient so that the viewer does not distort the video signal displayed on the display, and the distortion correction coefficient calculation A distortion correction unit that performs distortion correction on the video signal displayed on the display using the distortion correction coefficient calculated by the means , It is those with a. Here, the distortion correction coefficient calculation unit is configured to allow the viewer to watch the video signal displayed on the display based on the rotation angle of the display detected by the rotation angle detection unit and the viewing distance. Alternatively, the distortion correction coefficient may be calculated so that the video signal is displayed on a virtual plane passing through a predetermined axis on the display.

  In order to achieve the above object, according to the video signal distortion correction method in the display device with a rotation mechanism of the present invention, when the display angle is changed, the display is rotated based on the initial rotation angle of the display. Based on the detected angle of rotation, the detected rotation angle of the display, and the viewing distance between the display and the viewer, the video signal displayed on the display is distorted even when viewed by the viewer. And a step of calculating a distortion correction coefficient so as not to cause a distortion correction to the video signal displayed on the display using the calculated distortion correction coefficient.

  According to the present invention, even if the display is rotated, the rotation angle of the display based on the rotation angle in the initial state of the display is detected, and the detected rotation angle of the display and the viewing between the display and the viewer are detected. Based on the distance, the distortion correction coefficient is calculated so that the viewer does not distort the video signal displayed on the display, and the distortion correction is performed on the video signal displayed on the display. Can provide natural images.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a display device with a rotation mechanism according to the present invention.

  The display device with a rotation mechanism according to the present embodiment includes a signal generation source 11, a video processing unit 12, a distortion correction unit 13, a distortion coefficient calculation unit 14, an operation unit 15, a viewing distance setting unit 16, and a display. 17, a rotation mechanism 18, and a rotation angle detection unit 19. The rotation mechanism 18 is provided between the display 17 and a stand (not shown) that supports the display 17, and may be a mechanism that manually rotates the display 17 such as pushing and rotating the display 17 or a remote controller (see FIG. It is possible to use either a mechanism for automatically rotating the display 17 by driving a motor or the like based on a swivel command or a turn instruction from a not shown). Note that the display device with a rotation mechanism of the present embodiment includes a cathode ray tube, a television such as a liquid crystal panel or a plasma panel, and a television such as a so-called rear projection as long as it has the display 17 with a rotation mechanism. .

  Next, an outline of the operation of each component shown in FIG. 1 will be described.

  First, the signal generation source 11 outputs a video input signal from a TV tuner or an external device to the video processing unit 12, and the video processing unit 12 performs various video signal processing and outputs the video signal to the distortion correction unit 13. The distortion correction coefficient calculation unit 14 receives the viewing distance that is optimal for the viewer input from the operation unit 15 and stored in the viewing distance setting unit 16, and the initial angle of the screen of the display 17 detected by the rotation angle detection unit 19. An optimal distortion correction coefficient is calculated from the rotation angle with respect to, and output to the distortion correction unit 13.

  The distortion correction unit 13 performs distortion correction processing on the video signal input from the video processing unit 12 using the distortion correction coefficient calculated by the distortion correction coefficient calculation unit 14, outputs the video signal to the display 17, and displays the video. .

  Next, characteristic processing in this apparatus will be described.

  FIG. 2 is a flowchart showing a characteristic process of this apparatus. FIG. 3 is a diagram illustrating the relationship between the viewer and the display.

  When this apparatus is first installed or moved, the viewer rotates the display 17 and adjusts it to an optimum rotation angle. Therefore, in the present embodiment, this step is first performed in step 21. The initial angle of the display 17 in the initial installation state is set in the rotation angle detection unit 19, and the viewing distance which is an approximate distance between the viewer and the display 17 is set by the operation unit 15 operated by the viewer. It is stored in the viewing distance setting unit 16 (step 21).

  Here, the initial angle and viewing distance of the display 17 are set by a simple button for setting the initial angle and viewing distance on a remote controller (not shown), and the viewer can press the button, or the like. Even if there is no simple button, for example, “On the current display angle can be set to the initial angle? What is the viewing distance?” May be displayed, and a general-purpose determination button on the remote controller may be pressed to initialize the angle of the rotation position of the first display 17 to 0 ° or set the viewing distance. In addition, a switch (not shown) is provided under a stand (not shown) that supports the display 17, or the on / off operation of the provided switch (not shown) is used. This switch automatically detects that the device has been moved, and each time the device is moved, a message prompting the setting of the initial angle and viewing distance is displayed on the display 17, and the above simple button and enter button are pressed. Of course, it may be made to push. The viewing distance may be set by an arrow button on a remote controller (not shown), an audio increase / decrease button, a channel change button, or the like.

  Here, in the present embodiment, for example, as shown in FIG. 3A, the optimal angle of the display 17 as viewed from the viewer is set to a rotation angle of 0 ° with the viewer's position as a predetermined position. Further, as shown in FIG. 3B, the angle at which the display 17 is rotated from that state is defined as θ °. As shown in FIG. 3B, when the display 17 is rotated by θ °, when the viewer views the video displayed on the screen of the display 17 rotated by θ °, the video looks like a trapezoid and the video is displayed. It will be distorted.

  Next, the distortion correction coefficient calculation unit 14 of the present apparatus sets an initial correction coefficient (step 22). It should be noted that, in the initial state where the rotation angle is 0 °, no correction is required, so a coefficient is set so that the video signal output from the distortion correction unit 13 and the video signal input from the video processing unit 12 are exactly the same. do it.

  Next, when the viewer rotates the display 17 via the rotation mechanism 18, the rotation angle detector 19 detects the rotation angle with respect to the set angle in the initial state (step 23 "YES"), and the detected rotation angle. Is output to the distortion correction coefficient calculation unit 14. The rotation angle detector 19 detects the rotation angle of the display 17 using a general-purpose method such as detecting the rotation angle by counting the number of pulses generated based on the rotation angle, such as a rotary encoder. .

  In the distortion correction coefficient calculation unit 14, based on the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19 and the viewing distance set in the viewing distance setting unit 15, an optimum distortion correction coefficient, that is, the display 17. A distortion correction coefficient is calculated such that the viewer does not distort the video signal displayed on the video signal, and the coefficient is output to the distortion correction unit 13 (step 24). If rotation is not detected, the original correction coefficient is used.

  Next, an example of a correction coefficient calculation method by the distortion correction coefficient calculation unit 24 in step 24 will be described.

  In FIG. 3, the case has been described where the horizontal screen center 31 of the display 17 is the rotation axis, but generally there are few cases where the screen center 31 of the display 17 is on the rotation axis of the display 17.

  That is, as shown in FIG. 4A, the horizontal screen center 42 of the display 17 is often located at a position slightly shifted from the rotation axis 41 of the display 17. When the display 17 is rotated, keystone correction is performed so that the aspect ratio of the screen of the display 17 does not change when viewed from the viewer. This is a virtual screen parallel to the initial position screen with respect to the rotated screen. Correction is performed assuming that the image is projected.

  However, if the keystone correction is performed based on the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19 and the viewing distance set in the viewing distance setting unit 15, the portion protruding from the screen of the display 17, Since a portion where nothing is displayed is generated on the screen, the optimum method cannot be limited to one type, and a plurality of methods can be considered.

  For example, there are four possible virtual screens A, B, C, and D as shown in FIG.

  The virtual screen A in FIG. 4B is closest to the viewer based on the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19 and the viewing distance set in the viewing distance setting unit 15. This is a case where the vertical direction of the corner 171 of the side display 17 is used to fill the screen. In this case, as shown in FIG. 5 (a), the video signal 51a moves away from the left corner 171, ie, the side closer to the viewer, on the right side of the display 17, ie, the viewer. Since the correction coefficient is calculated so as to be enlarged and displayed, the use efficiency of the screen of the display 17 is the highest, and the image can be viewed larger. However, the area of the video signal 51a that is not displayed on the screen of the display 17 also becomes large. Note that a video signal 51 a corrected to a trapezoid based on the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19 and the viewing distance set in the viewing distance setting unit 15 is displayed on the display 17. When the video is viewed from the viewer's position, it will appear correctly as a rectangular video. The same applies to the case of the video signals 51b to 51d shown in FIGS. 5 (b) to 5 (d).

  Also, the virtual screen D in FIG. 4B is obtained from the viewer based on the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19 and the viewing distance set in the viewing distance setting unit 15. This is a case where the vertical direction of the corner 174 of the farthest display 17 is used to fill the screen. In this case, as shown in FIG. 5D, contrary to the case of the virtual screen A shown in FIG. 5A, all the video signals 51d can be displayed in the screen, but all the screens of the display 17 are displayed. Since the video signal 51d is not displayed on the screen, the video becomes small.

  Also, the virtual screen B in FIG. 4B is an intermediate between the virtual screens A and D, and the viewing angle set by the viewing distance setting unit 15 and the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19. This is a method in which the vertical direction of the rotation center 41 (see FIG. 4A) of the display 17 is used to fill the screen of the display 17 based on the distance. This is because, when the viewer's line of sight is fixed on the axis of the rotation center 41 of the display 17, the vertical direction of the line of sight can always be used to fill the screen, and a more natural image can be provided. It is. In this case, the virtual screen B passes through a line 172 where the line connecting the rotation center 41 of the display 17 and the viewer and the screen of the display 17 intersect.

  The virtual screen C in FIG. 4C is an intermediate between the virtual screens A and D, and the viewing angle set by the viewing distance setting unit 15 and the rotation angle θ ° of the display 17 detected by the rotation angle detection unit 19. This is a method of using the vertical direction of the screen center 42 (see FIG. 4A) in the horizontal direction of the screen of the display 17 to fill the screen of the display 17 based on the distance. This is because when the viewer's eyes are fixed on the screen center 42 in the horizontal direction of the screen of the display 17, the vertical direction of the eyes can always be used to fill the screen, and a more natural image can be obtained. It is a method that can be provided. In this case, the virtual screen C passes through the line 173 on the screen center 42 in the horizontal direction of the screen of the display 17.

  As described above, in the present embodiment, the distortion correction of the video signal may be limited to any one of the four methods of the virtual screens A, B, C, and D, or from the viewer. The virtual screens may be switched, or the virtual screens may be formed at positions other than the virtual screens A, B, C, and D. Furthermore, the virtual screens A, B, C, and D are automatically selected according to the viewing distance of the viewer with respect to the display 17, for example, when the viewing distance is as short as 2 m or less, the virtual screen D is automatically selected. When the viewing distance is in the middle of 2 m to 3 m, the virtual screen C is automatically selected. When the viewing distance is as long as 5 m or more, the virtual screen A is automatically selected. On the other hand, when the viewing distance is as short as 2 m or less, the virtual screen A is automatically selected, and when the viewing distance is as long as 5 m or more, the virtual screen D may be automatically selected.

  Therefore, according to the present embodiment, even when the display 17 is rotated by the rotation mechanism 18, the video signal displayed on the display is viewed from a predetermined position based on the current angle of the display 17 and the viewing distance. Since the distortion correction coefficient is calculated so as not to be distorted, and the distortion correction is performed on the video signal displayed on the display 17 using the distortion correction coefficient, even if the display 17 is rotated, it is natural for the viewer. Video can be provided.

  In the above description, only the rotation of the display 17 in the horizontal direction has been described. However, the present invention is not limited to this, and the same method can be used when the display 17 is rotated in the vertical direction. it can.

It is a block diagram which shows the structure of one Embodiment of the display apparatus with a rotation mechanism which concerns on this invention. It is a flowchart which shows the characteristic process of this apparatus. It is a figure which shows the relationship between a viewer and a display. (A), (b) is a figure which respectively shows the relationship between the rotating shaft 41 of the display 17, and the horizontal direction screen center 42, and the relationship between the display 17 and the virtual screens A, B, C, and D in distortion correction. . (A)-(d) is a figure which shows the state of the video signals 51a-51d by which distortion correction displayed on the display 17 in virtual screen A, B, C, D, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Signal generation source 12 Image processing part 13 Distortion correction part 14 Distortion correction coefficient calculation part 15 Operation part 16 Viewing distance setting part 17 Display 18 Rotation mechanism 19 Rotation angle detection part

Claims (3)

A rotation mechanism that can adjust the angle of the display that displays the video signal;
A viewing distance setting unit for storing a viewing distance between the display and the viewer;
When the angle of the display changes, a rotation angle detection unit that detects a rotation angle of the display with reference to an initial rotation angle of the display;
Based on the rotation angle of the display detected by the rotation angle detector and the viewing distance, a distortion correction coefficient is calculated so that the viewer does not distort the video signal displayed on the display. A distortion correction coefficient calculation unit;
A distortion correction unit that performs distortion correction on the video signal displayed on the display using the distortion correction coefficient calculated by the distortion correction coefficient calculation unit;
A display device with a rotation mechanism. The display device with a rotation mechanism according to claim 1, wherein the distortion correction coefficient calculation unit is
Based on the rotation angle of the display detected by the rotation angle detector and the viewing distance, the video signal displayed on the display is not distorted even when viewed by the viewer, and on the display The display device with a rotation mechanism according to claim 1, wherein a distortion correction coefficient is calculated so that the video signal is displayed on a virtual plane passing through a predetermined axis. Detecting the rotation angle of the display relative to the rotation angle of the initial state of the display when the angle of the display has changed;
Based on the detected rotation angle of the display and the viewing distance between the display and the viewer, a distortion correction coefficient is set so that the viewer does not distort the video signal displayed on the display. A calculating step;
Performing distortion correction on the video signal displayed on the display using the calculated distortion correction coefficient;
A distortion correction method for a video signal in a display device with a rotation mechanism including:

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