JP2001154651A - Display controller, display device, display control method for display device and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display controller capable of performing a display having the same quality as that of a picture facing to a viewer in a display device which does not have a swiveling function and a tilting function. SOLUTION: This display controller is constituted of a display area correcting device correcting the display area of a display part, a position detecting device detecting that a display position is changed, a viewing position detecting device detecting the position of a viewer and a control part controlling the display area correcting device based on the results of the position detecting device and the viewing position detecting device and it controls the correction of the display area in accordance with the display position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device for controlling display of a display device capable of adjusting a position.

[0002]

2. Description of the Related Art A conventional display device is set so that a screen display without distortion can be obtained by directly facing a screen and a viewer. For this reason, in order to obtain a good image, the viewer has to use a tilt function and a swivel function provided on the display unit to make adjustments so as to face the screen.

[0003]

However, the conventional display device has the following problems.

(1) In the case of a large-sized display device in which the weight of the display unit is increased, if the display unit is provided with a tilt function or a swivel function, the weight of the entire device becomes very heavy.

(2) In order to realize a tilt function in a large flat display such as a plasma display device, it is necessary to increase the size of the stand in order to prevent falling. Further, when the swivel function is realized, a space is required in the depth, and it is difficult to achieve space saving. When the display device is mounted on a wall, it is very difficult to realize the swivel function.

(3) If the swivel function and the tilt function are not realized, the display looks distorted depending on the position of the viewer.
That is, as shown in FIG. 15, in the case of the display position 153 directly facing the viewpoint, the square display 154 looks square, but in the case of the display position 151 above the viewpoint, the lower side is displayed due to the perspective of the display unit. Are long sides. In addition, in the case of the display position 155 below the viewpoint, a trapezoid 156 having the upper side as a long side contrary to the display 151.
Therefore, there is a problem that the display looks distorted depending on the position of the viewer.

The present invention has been made in view of the above-mentioned conventional problems, and provides a display control device or the like which can display an image having the same quality as an image facing a viewer with a display device having neither a swivel function nor a tilt function. The purpose is to:

[0008]

According to a first aspect of the present invention, there is provided a display control apparatus, comprising: a position adjusting unit configured to adjust a position of a display device; It is characterized by comprising a position detecting means for detecting, and a first correction control means for performing perspective correction on a display area of the display device in accordance with the movement amount detected by the position detecting means.

According to a second aspect of the present invention, there is provided the display control device according to the first aspect, wherein the change unit changes the reference position information of the display device to an arbitrary position; A second correction control unit that performs a perspective correction in a reverse direction on the display area of the display device around a reference display position based on the change result.

According to a third aspect of the present invention, there is provided a display control device according to the second aspect, further comprising means for storing position information serving as a reference of the display device.

According to a fourth aspect of the present invention, there is provided a display control device, comprising: detecting means for detecting a position of a viewer of the display device; determining means for determining the position detected by the detecting means; A first correction control unit for correcting the display area of the display device based on the distance.

According to a fifth aspect of the present invention, in the display control device according to the fourth aspect of the present invention, there is provided a display control device, wherein: a changing means for changing a reference position information of the display device to an arbitrary position; A second correction control unit that performs a perspective correction in the reverse direction with respect to the display area around a reference display position based on the change result.

According to a sixth aspect of the present invention, there is provided a display control device according to the fifth aspect, further comprising means for storing position information serving as a reference of the display device.

In the display device according to the present invention,
Display area correction means for correcting the display area of the display unit, a position detection device for detecting that the display position has changed, a viewing position detection device for detecting the position of a viewer, the position detection device, and the viewing position detection Control means for controlling the operation of the display area correcting means according to the detection result of the device.

In a display control method for a display device according to the present invention, the amount of movement of the display device is detected, and perspective correction is performed on the display area of the display device in accordance with the detected amount of movement. It is characterized by performing.

According to a ninth aspect of the present invention, in the display control method of the display device according to the eighth aspect,
Providing changing means for changing the reference position information of the display device to an arbitrary position, and performing a perspective correction in the opposite direction to the display area around a reference display position based on a change result of the changing means. It is characterized by.

According to a tenth aspect of the present invention, in the display control method for a display device, a position of a viewer of the display device is detected, the detected position is determined, and a display area of the display device is determined based on the determination information. Is corrected for perspective.

According to a display control method of a display device according to the present invention, in the display control method of the display device according to the tenth aspect, changing means for changing the reference position information of the display device to an arbitrary position. And performing perspective correction in the reverse direction on the display area around a reference display position based on a change result of the change unit.

In the storage medium according to the twelfth aspect, a step of detecting a movement amount of the display device and a step of performing perspective correction on a display area of the display device according to the detected movement amount. And storing a program having the following.

According to a thirteenth aspect of the present invention, in the storage medium according to the twelfth aspect, the reference display based on the change result by the change means for changing the reference position information of the display device to an arbitrary position. A program having a step of performing a perspective correction in the opposite direction to the display area around a position is stored.

In the storage medium according to the present invention, a step of detecting a position of a viewer of the display device, a step of determining the detected position, and a display area of the display device based on the determination information And a step of correcting perspective.

According to a fifteenth aspect of the present invention, in the storage medium according to the fifteenth aspect, a reference display position based on a change result of changing means for changing the reference position information of the display device to an arbitrary position. , A program having a step of performing a perspective correction in the reverse direction with respect to the display area is stored.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is an external view of a display device equipped with a display control device according to a first embodiment of the present invention.

The display section 11 is mounted in a structure that moves up and down along the columns 12. The display unit 11 has a display area 13 for displaying an image. When the viewer is directly facing the display unit 11, the square displayed in the display area 13 looks like a square without distortion as in the display graphic 14.

FIG. 2 is an external view in which the display unit 11 is moved upward from the state of FIG.

The movement amount of the display unit 11 is detected by a movement amount detection device for the display unit described later. According to the detected movement amount, the effective display area of the display area 13 is
By performing perspective correction processing by a horizontal deflection control unit 89 described later, the rectangular shape is transformed into a trapezoidal shape having a longer side on the upper side.

As a result of deforming the effective display area of the display area 13 according to the amount of movement described above, the upper side of the display graphic 14, which is a display in which the perspective is corrected like the display graphic 24, is defined as a long side. Deformed into a trapezoidal shape. Therefore, when the position of the viewer is the same as that shown in FIG. 1, the side farther from the viewpoint is enlarged, and the viewer looks like a square similar to the display graphic 14.

FIG. 3 is an external view in which the display unit 11 is moved downward from the state of FIG.

The amount of movement of the display unit 11 is determined by the display unit 1 described later.
1 is detected by the movement amount detection device. According to the detected movement amount, the horizontal deflection control unit (89 in FIG. 8) performs perspective correction processing on the effective display area of the display area 13 so that the lower side from the rectangle is changed to the longer side. Into a trapezoidal shape.

As a result of deforming the effective display area of the display area 13 in accordance with the movement amount, the display graphic 14 is a display in which the perspective is corrected like the display graphic 34, and the lower side is a long side. Transform into a trapezoid. Because of this,
In the case of the same time as in FIG. 1, the side far from the viewpoint is enlarged, and the viewer sees a rectangle similar to the display graphic 14.

In the case of a display device using a CRT, usually,
As shown in FIG. 4, an electron beam draws a locus of a scanning line 41 (solid line) and a return line 42 (dotted line) in a display area 13 for displaying an image on the display unit 11. The light emission luminance is determined by the intensity of the electron beam, and an image is formed by a collection of light emitting points during the scanning line 41.

FIG. 5 shows that the electron beam is applied to the scanning line 41 and the return line 4.
2 is a waveform diagram showing a sawtooth current wave which is a signal for making a vertical return line 2 and a vertical return line 43. FIG.

This sawtooth current wave comprises a vertical sawtooth current wave 51 and a horizontal sawtooth current wave group 52. One vertical sawtooth current wave 51 corresponds to one vertical period, and the horizontal sawtooth current wave group 52 for the number of horizontal periods required during that period.
Occurs. The horizontal sawtooth current wave 53 is obtained by enlarging the horizontal sawtooth current wave group 52 and extracting only one waveform.
The vertical scanning period 511 in which the vertical sawtooth current wave increases,
The electron beam is deflected from the top to the bottom.

The vertical flyback period 512 in which the vertical sawtooth current wave decreases deflects the electron beam from the lower end to the upper end, and the horizontal scanning period 531 in which the horizontal sawtooth current wave increases deflects the electron beam from the left end to the right end. Further, the horizontal retrace period 532 during which the vertical sawtooth current wave decreases deflects the electron beam from the right end to the left end.

If this is made to correspond to the trajectory of the electron beam in FIG. 4, the period excluding the vertical retrace 43 corresponds to the vertical scanning period 511, the vertical retrace 43 corresponds to the vertical retrace period 512,
The scanning line 41 is controlled to correspond to the horizontal scanning period 531, and the retrace line 42 is controlled to correspond to the horizontal retrace period 532.

If control is performed like the sawtooth current wave shown in FIG. 5, an image as shown in FIG. 1 is obtained, and the image input to the display device is displayed on the display unit 11 without being deformed.

Next, a sawtooth current wave which is a modified display shown in FIG. 2 will be described with reference to FIG.

In the modified display shown in FIG. 2, since the display area is not deformed in the vertical direction, the vertical sawtooth current wave 61 is, as shown in FIG. 6, the vertical sawtooth current of the display of FIG. It has the same waveform as the wave 51. In the horizontal direction, since the display width becomes narrower as it goes downward, the amplitude of the horizontal sawtooth current wave 62 gradually decreases during the vertical scanning period 611.

Therefore, comparing the horizontal sawtooth current wave 63 at the upper end of the display section with the horizontal sawtooth current wave 64 at the lower end, the frequencies are the same, but at the start of the horizontal scan period, the start of the horizontal scan period 641 is started. Time starts with the higher value. For the horizontal retrace period, the horizontal retrace period 6
32 starts from a lower value. As a result, the image is transformed into a trapezoid whose upper side is a long side as shown in the display graphic 24.

The display graphic 34 of FIG. 3 can be realized by controlling the sawtooth current wave of FIG. 6 so that the amplitude is reduced at the upper end and the amplitude is increased at the lower end. Further, the above-described change of the display area 14 changes the amplitude control according to the change of the height of the display unit 11.

Next, the control for changing the height will be described.

FIG. 7 shows a device for detecting the amount of movement of the display unit 11, which is incorporated in the column 12 and the display unit 11.

The gear 72 has a hole 71 formed in the column 12 so as not to run idle. When the display unit 11 moves up and down the support 12, the gear 72 rotates clockwise or counterclockwise in synchronization therewith. The sensor 74 counts the hole 73 of the gear to obtain the direction and the number of rotations of the gear 72 described above.

The control unit, which is the display control device of the present invention, is configured as shown in FIG. 8, and controls the above-mentioned deformed display from the above-mentioned information. The CPU 81 has a ROM 83 for storing programs and predetermined data, and an RA for temporary storage.
M82 and an NVRAM 84 for storing various settings are connected via a memory bus 85.

The CPU 81 includes a height detector 87 for receiving information from the above-described movement amount detector, and a vertical deflection controller 8 for controlling the above-described vertical deflection sawtooth current wave.
8 and a horizontal deflection control unit 89 for controlling the above-mentioned horizontal deflection sawtooth current wave are connected via a control bus 86.

The CPU 81 executes the control program stored in the ROM 83 by using the RAM 82 for temporarily storing the work amount data required for executing the control program, and using the NVRAM 84 for storing the information required when the power is turned off. With this control program, the CPU 81 obtains the height of the display unit 11 from the height detection unit 87 and
To save. Then, based on the stored height data, the built-in ROM table is switched to the horizontal deflection control unit 89 to generate a horizontal sawtooth current wave as shown in FIG.

When the display unit 12 is moved left and right, the vertical deflection control unit 88 is used to
By performing the same control as in No. 9, display control is possible. Furthermore, the viewer can operate the operation unit switch 810 to change the reference of the position of the display unit 12 so that the image can be transformed into an image according to the taste.

FIG. 9 is a diagram showing a sawtooth current wave when the display unit 12 is moved right and left.

In the figure, a vertical sawtooth current wave 91 is shown.
Solid waveform 93 for vertical image deformation
And a dotted waveform 94 without vertical image deformation. This waveform is synchronized with the horizontal sawtooth current wave 92. In addition, the amplitude direction is inverted with respect to the waveform 94 in which the center of the image is not vertically deformed to Sakai. The image obtained by this is an image obtained by rotating the image of FIG. 2 by 90 degrees counterclockwise.

Furthermore, the image rotated clockwise by 90 degrees can be obtained by making the amplitude lower toward the lower side and higher toward the higher side as compared with the waveform 94 without vertical image deformation. .

As described above, according to the present embodiment, by changing the display area in accordance with the position of the display unit, a display device having neither a swivel function nor a tilt function is equivalent to an image facing the viewer. And a high-quality display without distortion can be provided.

[Second Embodiment] Although the display device of the first embodiment is constituted by a CRT, this embodiment shows an example in which this is changed to a dot matrix display device.

When the input display image shown in FIG. 10 is displayed at the upper position shown in FIG. 2, the sampling cycle is sequentially delayed from the upper end to the lower end of the input display image. More specifically, the range of the upper image frame 102, which is a part of the upper image of the input display image 101, is sampled, and the range of the lower image frame 103, which is a part of the lower image, is also sampled. I do.

In the range of the bottom image frame 103 in this example, the outside of the frame of the input display image 101 is sampled. Since there is a non-image period in a portion outside the frame of the input display image 101, the non-image period is sampled.
When sampling a period before the horizontal synchronizing signal indicating the period of the horizontal line or a period after the horizontal synchronizing signal, control is performed so that no image is inserted and the number of image samples in the frame becomes the same.

The control of the sampling period can be realized by controlling a PLL that generates a clock based on a synchronization signal. The image obtained by the above-described sampling is subjected to timing control using a delay unit or a memory unit, and is displayed on a dot matrix display device, whereby an output display image 111 in FIG. 11 is obtained.

The upper frame 112 of the output image in FIG.
This corresponds to the upper end image frame 102, and almost no deformation occurs in the image. The lower image frame 113 of the output image in FIG. 11 corresponds to the lower image frame 103, and the image goes downward and is sequentially reduced as shown by the display area boundary 114.

When the display section is below, this can be realized by sequentially increasing the sampling period from the upper end to the lower end of the input display image.

In addition, without changing the sampling period, the input display image is stored in the memory means, and the reduction magnification is changed stepwise using digital processing such as a nearest pixel method, a linear interpolation method, or an image reduction method. A similar image deformation is possible by changing to.

When the display unit is in the maximum display mode and the enlargement processing is being performed, the same image deformation can be performed by changing the enlargement magnification stepwise.

As described above, also in the present embodiment, the same effects as those in the first embodiment can be obtained.

[Third Embodiment] In the present embodiment, the first
In the embodiment and the second embodiment, an example is shown in which a function of detecting a viewer viewing position is added.

FIG. 12 is a view showing a viewer position detection image according to the present embodiment.

This viewer position detection image is generated by digitally correcting the camera position and the position of the display unit with respect to the image of one or more cameras attached to the display device in order to specify the position of the viewer. It is a viewer position detection image.

This viewer position detection image is divided as shown by a frame 121 in order to determine the position of the viewer. The display image is deformed according to the position of the frame to which the viewer belongs.

In the example shown in FIG. 12, since the viewer 122 is located in the center frame, the display image is the same as the input image and no image deformation is performed. On the other hand, in the example shown in FIG. 13, the viewer position detection image input by the camera is
The viewer 132 exists in the upper left frame 131 as compared with FIG. In this case, the rectangular display is modified as described in the first and second embodiments, and is displayed as shown in FIG.

As described above, according to the present embodiment, a display device having no tilt function or swivel function in the display unit can change the display area according to the position of the display unit or the viewing position of the viewer. As a result, the image is corrected, and it is possible to view a display without distortion.

Note that the present invention is not limited to the apparatus of the above-described embodiment, and may be applied to a system including a plurality of devices or an apparatus including a single device.
A storage medium storing program codes of software for realizing the functions of the above-described first embodiment or second embodiment is supplied to a system or an apparatus, and a computer (or CPU or MPU) of the system or apparatus stores the storage medium in the storage medium. Needless to say, the program code is completed by reading and executing the program code.

In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention. As a storage medium for supplying the program code, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, and a ROM can be used. When the computer executes the readout program code, not only the functions of the above-described embodiments are realized, but also the OS or the like running on the computer performs the actual processing based on the instruction of the program code. It goes without saying that a case where some or all of the operations are performed and the functions of the above-described embodiments are realized by the processing is also included.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the program code is read based on the next program code. Needless to say, the extended function may be performed by a CPU or the like provided in an expansion board or an expansion unit to perform a part or all of the actual processing, and the processing may realize the functions of the above-described embodiments. No.

[0071]

As described in detail above, according to the present invention,
Even if the display device does not have a swivel function or a tilt function, it is possible to perform a high-quality display on the display unit of the display device, which is equivalent to the case where the viewer is directly facing the viewer.

[Brief description of the drawings]

FIG. 1 is an external view of a display device according to a first embodiment of the present invention.

FIG. 2 is an external view in which a display unit 11 is moved upward from the state of FIG.

FIG. 3 is an external view in which a display unit 11 is moved downward from the state of FIG.

FIG. 4 is a diagram illustrating trajectories of scanning lines and retrace lines in the case of a display device using a CRT.

FIG. 5 is a waveform diagram showing a sawtooth current wave.

FIG. 6 is a waveform diagram showing a sawtooth current wave.

FIG. 7 is a cross-sectional view illustrating a movement amount detection device of a display unit.

FIG. 8 is a block diagram illustrating a configuration of a control unit.

FIG. 9 is a diagram showing a sawtooth current wave.

FIG. 10 is a diagram showing an input display image.

FIG. 11 is a diagram showing an output display image.

FIG. 12 is a diagram showing a viewer position detection image according to a third embodiment.

FIG. 13 is a diagram showing a viewer position detection image input by a camera.

FIG. 14 is a diagram illustrating a display image obtained by detecting a viewing position.

FIG. 15 is a diagram showing a conventional problem.

[Explanation of symbols]

 81 CPU 82 RAM 83 ROM 84 NVRAM 85 Memory bus 86 Control bus 87 Height detection unit 88 Vertical deflection control unit 89 Horizontal deflection control unit 810 Operation unit switch

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/44 H04N 5/44 Z 5/64 581 5/64 581E (72) Inventor Makoto Uehara Ota, Tokyo 3-30-2 Kushita Maruko F-term (reference) in Canon Inc. DD01 EE13 EE19 EE30 EE50 GG41

Claims (15)

[Claims] 1. A position adjusting means for adjusting a position of a display device, a position detecting means for detecting a position of the display device, and a position detecting means for detecting the position of the display device. A display control device comprising: first correction control means for performing perspective correction on a display area. 2. A change means for changing position information serving as a reference of the display device to an arbitrary position, and a display area of the display device being inverted with respect to a reference display position based on a change result of the change means. 2. The display control device according to claim 1, further comprising second correction control means for correcting the perspective in the direction. 3. The display control device according to claim 2, further comprising means for storing position information serving as a reference of the display device. 4. A detecting means for detecting a position of a viewer of the display device, a determining means for determining the position detected by the detecting means, and a perspective correction of a display area of the display device based on information of the determining means. A display control device comprising: a first correction control unit that performs the correction. 5. A changing means for changing position information serving as a reference of the display device to an arbitrary position, and a perspective in a direction opposite to the display area around a reference display position based on a change result of the changing means. Second to make correction
5. The display control device according to claim 4, further comprising: a correction control unit. 6. The display control device according to claim 5, further comprising means for storing position information serving as a reference of the display device. 7. A display area correcting means for correcting a display area of a display unit, a position detecting device for detecting a change in a display position, a viewing position detecting device for detecting a position of a viewer,
A display device comprising: the position detection device; and control means for controlling an operation of the display area correction means based on a detection result of the viewing position detection device. 8. A display control method for a display device, comprising detecting an amount of movement of a display device and performing perspective correction on a display area of the display device according to the detected amount of movement. 9. A change unit for changing position information serving as a reference of the display device to an arbitrary position, wherein a change is made in a direction opposite to the display area around a reference display position based on a change result of the change unit. 9. The display control method for a display device according to claim 8, wherein perspective correction is performed. 10. A display control of a display device, comprising detecting a position of a viewer of the display device, determining the detected position, and correcting a display area of the display device based on the determination information. Method. 11. A changing means for changing position information serving as a reference of the display device to an arbitrary position, wherein a change is made in a direction opposite to the display area around a reference display position based on a change result of the changing means. The display control method for a display device according to claim 10, wherein perspective correction is performed. 12. A program having a step of detecting a moving amount of a display device and a step of performing perspective correction on a display area of the display device according to the detected moving amount. Storage medium. 13. A step of performing perspective correction in a reverse direction on the display area around a reference display position based on a change result by a change unit that changes reference position information of the display device to an arbitrary position. 13. The storage medium according to claim 12, wherein a program having the following is stored. 14. A program comprising a step of detecting a position of a viewer of a display device, a step of determining the detected position, and a step of correcting a display area of the display device based on the determination information. A storage medium characterized by being stored. 15. A step of performing perspective correction in a reverse direction on the display area around a reference display position based on a change result of a change unit that changes reference position information of the display device to an arbitrary position. 15. The storage medium according to claim 14, wherein said program has a program stored therein.