JP2001339671A - Projector device - Google Patents

Abstract

(57) [Summary] The present invention automatically corrects horizontal and vertical trapezoidal distortion of an image by detecting an angle of a projector device and setting information of a screen angle as an offset value. The present invention relates to a projector device that performs SOLUTION: A screen inclination angle θ2 is set in an angle offset setting circuit 13, and a subtraction circuit 11 subtracts θ2 from the angle θ1 detected by the angle sensor circuit 12 to obtain θ1−θ.
2 is sent to the trapezoidal correction calculation circuit 4 via the control circuit 10 and the trapezoidal correction is performed at the angle θ1−θ2. An image without distortion can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting horizontal and vertical angles of a projector device and automatically setting information on a screen angle as an offset value, thereby automatically forming a horizontal and vertical trapezoidal image. The present invention relates to a projector device that corrects distortion.

[0002]

2. Description of the Related Art As a conventional projector device, for example, a projector device described in Japanese Patent Application Laid-Open No. Hei 9-27079 is known. 9 to 11 show configuration diagrams for explaining the basic concept. FIG. 9 is a circuit block diagram of a conventional projector device, FIG. 10 is a configuration diagram of the conventional projector device, and FIG. 11 shows an outline of an image before and after keystone correction on a screen. The sync signal is synchronized and separated by the sync signal processing circuit 9 from the sync signal input from the sync signal input terminal 8 of the projector device 21 and the video signal input terminal 1 is supplied to the video signal input terminal 1 by a clock or control signal generated by the control circuit 10 based on the signal. The input video signal is converted into a digital signal by an analog-to-digital conversion circuit 2, and a signal processing operation circuit 3 performs a reduction or enlargement process of an image using a memory 7, and displays the image on a display device 6. Converts the video signal processed by the signal processing operation circuit 3 and displays the video on the display device 6. As shown in FIG. 10, when a projector device 21 having a built-in angle sensor circuit 12 of the projector device is tilted by θ1 in the vertical direction and projected on a vertically standing screen 22, a trapezoidal distortion as shown in FIG. As shown in FIG. 9, the information of the angle θ1 detected by the angle sensor circuit 12 of the projector device is supplied to the trapezoid correction arithmetic operation circuit 4 through the control circuit 10, so that the trapezoid correction is also performed at the same time, Can be obtained.

[0003]

However, when the screen 22 is tilted, the trapezoidal correction is performed only by the information on the tilt of the projector device 21 in the conventional configuration, and the information on the tilt of the screen 22 is ignored, so that the correction cannot be performed properly.

An object of the present invention is to provide a projector device which can perform a trapezoidal correction exactly even if the screen 22 is tilted by setting an offset with respect to the angle information.

[0005]

According to a first aspect of the present invention, an angle information of a screen inclination obtained in advance is set to an offset value with respect to angle information of a projector device detected by an angle sensor circuit. This is a projector device that can automatically perform keystone correction even on a screen with an inclination by setting as.

According to a second aspect of the present invention, a screen angle sensor circuit for detecting an angle of the screen is provided on the screen, angle information of the inclination of the screen detected by cable or wireless is sent to the projector device, and this data is set as an offset value. This is a projector device that can automatically perform keystone correction even on a screen that is inclined.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first aspect of the present invention provides a light source,
In a projector device including a display device that modulates light emitted from a light source in accordance with image information, and a projection lens, angle information obtained from an angle sensor circuit of the projector device such as a gyro in the projector device is used. By setting a screen inclination angle obtained in advance as an offset value, there is an effect that trapezoidal correction can be automatically performed even on a screen having an inclination. According to a second aspect of the present invention, a screen whose angle of inclination is not known in advance is provided by providing an angle sensor circuit for detecting the angle of the screen on the screen, transmitting angle information obtained from the circuit to the projector device and setting the offset value as an offset value. Has the effect that the trapezoidal correction can be performed automatically.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention includes horizontal (left / right) trapezoidal correction, vertical (vertical) trapezoidal correction, or combined horizontal and vertical trapezoidal correction. Will describe one-dimensional trapezoidal correction in the vertical (vertical) direction.

An embodiment of the projector device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a circuit block diagram of a projector device according to a first embodiment of the present invention. FIG. 2 is a side view of an installation example of a vertical inclination of the projector device. When a projector device 21 having a built-in angle sensor circuit 12 is inclined at an angle θ1 and projected on a screen 22 inclined at an angle θ2, as shown in an outline 23 in FIG. The upper side becomes long trapezoid.
When trapezoid correction is performed only with the angle information of the angle sensor circuit 12,
The inclination angle θ2 of the screen 22 is ignored, the correction amount increases, and a trapezoid whose upper side is short as shown in the outline 24 in FIG. Therefore, as shown in FIG. 1, the inclination angle θ2 of the screen 22 is set in the angle offset setting circuit 13,
Angle θ1 detected by angle sensor circuit 12 by subtraction circuit 11
The information of θ1−θ2 obtained by subtracting θ2 from the information is sent to the trapezoidal correction calculation circuit 4 via the control circuit 10, and the trapezoidal correction is performed at the angle θ1−θ2. An image without trapezoidal distortion like the outer shape 25 of No. 3 can be obtained.

FIG. 4 is a plan view of an example of an installation in which the projector device is obliquely projected in the horizontal direction. FIG. 5 is an outline of an image before and after the keystone correction at that time.

FIG. 6 is a circuit block diagram of a projector device according to a second embodiment of the present invention. As shown in FIGS. 7 and 8, a screen angle sensor circuit 14 is provided on a screen 22 having a vertical or horizontal angle,
The detected information of the screen tilt angle θ2 is sent to the angle offset setting circuit 13 in the projector device 21 by cable or wirelessly, and the angle sensor circuit 11 of the projector device 21 uses the subtraction circuit 11 as in (Example 1). Θ1-subtracting θ2 from detected angle θ1
The information of θ2 is applied to the trapezoidal correction operation circuit 4 via the control circuit 10.
And performing trapezoidal correction at the angles θ1−θ2, it is possible to obtain an image without trapezoidal distortion as shown in the outline 25 in FIG. 3 in real time with respect to a change in the angle of the projector device 21 and the screen 22.

[0013]

As described above, according to the present invention, the trapezoidal correction can be automatically performed even on an angled screen by setting the angle offset. Also, by providing an angle sensor circuit such as a gyro on the screen, trapezoidal correction can be automatically performed in real time not only for the projector device but also for a change in the angle of the screen, so that an image without distortion can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a projector device showing an embodiment of the first invention of the present application.

FIG. 2 is a side view showing a state in which the projector device according to the first embodiment is installed so as to be vertically inclined.

FIG. 3 is an outline view of an image before and after a keystone correction in a state of FIG. 2;

FIG. 4 is a plan view showing a state where the projector device according to the first embodiment is installed by obliquely projecting horizontally.

FIG. 5 is an outline view of an image before and after the keystone correction in the state of FIG. 4;

FIG. 6 is a circuit block diagram of a projector device showing an embodiment of the second invention of the present application.

FIG. 7 is a side view showing a state where the projector device according to the second embodiment is installed with a vertical inclination.

FIG. 8 is a plan view showing a state where the projector device according to the second embodiment is installed by obliquely projecting horizontally.

FIG. 9 is a circuit block diagram of a conventional projector device.

FIG. 10 is a side view showing a state in which a conventional projector device is installed with a vertical inclination.

FIG. 11 is an outline view of an image before and after keystone correction in the state of FIG. 10;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 video signal input terminal 2 analog-to-digital conversion circuit 3 signal processing operation circuit 4 trapezoid correction operation circuit 5 display device drive circuit 6 display device 7 memory 8 synchronization signal input terminal 9 synchronization signal processing circuit 10 control circuit 11 subtraction circuit 12 projector device Sensor circuit for detecting the angle of the screen 13 Angle offset setting circuit 14 Screen angle sensor circuit for detecting the angle of the screen 21 Projector device 22 Screen 23 Image outline before trapezoid correction at the time of vertical inclination 24 At the time of projection with vertical inclination Image outline after trapezoidal correction of overcorrection amount of image 25 Image outline after trapezoidal correction of optimal correction amount when projecting with vertical tilt 26 Image outline before trapezoidal correction at horizontal oblique projection 27 Error at horizontal oblique projection Image outline after keystone correction of correction amount 28 Optimum correction for oblique projection in the horizontal direction Image outline after keystone correction

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeaki Yamano 1006 Kadoma Kadoma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. 5C058 BA23 BA27 BB13 BB25 5G435 AA01 BB17 CC09 DD06 DD09 DD11 FF15 GG28 GG46 LL15

Claims (8)

[Claims] 1. A sensor circuit for detecting a tilt angle of a projector device, a trapezoidal correction signal processing arithmetic circuit for correcting a trapezoidal distortion of an image, and an angle offset circuit capable of offsetting the tilt angle. A projector device capable of performing correction. 2. A vertical sensor circuit for detecting a vertical tilt angle of a projector device, a vertical trapezoidal correction signal processing arithmetic circuit for correcting vertical trapezoidal distortion of an image, and a vertical angle offset circuit capable of offsetting a vertical tilt angle. A projector device characterized in that, by offsetting the vertical angle of the projector device by the vertical tilt angle of the screen, vertical trapezoidal correction can be automatically performed even on a vertically inclined screen. 3. A horizontal sensor circuit for detecting a horizontal angle (azimuth) of the projector device, a horizontal trapezoidal correction signal processing operation circuit for performing horizontal (left / right) trapezoidal distortion correction of an image, and a horizontal angle. A horizontal angle offset circuit capable of offsetting, and by setting the horizontal angle (azimuth) of the projector device to be offset by the horizontal angle (azimuth) of the screen, a screen having a different horizontal angle (azimuth) from the projector device is provided. But a projector device that can automatically correct horizontal keystone. 4. A horizontal / vertical sensor circuit for detecting a horizontal angle (azimuth) and a vertical tilt angle of a projector device, and a horizontal / vertical trapezoidal correction signal processing for correcting horizontal (left / right) and vertical keystone distortion of an image. An arithmetic circuit and a horizontal / vertical angle offset circuit that can set the horizontal angle and vertical tilt angle offset can be set automatically. Even if the screen has a different horizontal angle (azimuth) from the projector device and has a screen that is vertically inclined, it is automatically set. A projector device that can perform horizontal and vertical keystone correction. 5. A sensor circuit for detecting a tilt angle of a projector device, a trapezoidal correction signal processing arithmetic circuit for correcting a trapezoidal distortion of an image, an angle offset circuit capable of offsetting a tilt angle, and a screen for detecting a tilt angle of a screen. A projector device comprising an angle sensor circuit, receiving angle information from a screen angle sensor circuit, offsetting the angle of the projector device, and performing trapezoidal correction even on an inclined screen. 6. A screen vertical angle sensor circuit for detecting a vertical tilt angle of a screen, receiving the angle information, offsetting the vertical angle of the projector device, and automatically forming a trapezoid in the vertical direction even on a vertically inclined screen. 6. The projector according to claim 5, wherein the correction can be performed. 7. A screen horizontal angle sensor circuit for detecting a horizontal angle (azimuth) of the screen is provided, the horizontal angle of the projector device can be offset by receiving the angle information, and the horizontal angle (azimuth) of the projector device can be offset. 6. The projector device according to claim 5, wherein horizontal trapezoidal correction can be automatically performed even on a screen having a different screen shape. 8. A horizontal / vertical angle sensor circuit for detecting a horizontal angle (azimuth) and a vertical tilt angle of the screen, receiving the angle information, and offsetting the horizontal angle and the vertical tilt angle of the projector device,
6. The horizontal and vertical trapezoidal correction can be automatically performed even on a screen having a different horizontal angle (azimuth) from the projector device and having a vertical inclination.
The projector device as described in the above.