JP5444947B2 - projector - Google Patents

Description

  The present invention relates to a projector.

  A projector that projects a projection image on an installation surface is known (see, for example, Patent Document 1). In this projector, the projected image is reflected by the reflecting surface of the free-form curved mirror and projected onto the installation surface.

JP 2008-209670 A

  By the way, when a projected image is projected on the entire projection area of the installation surface using a curved mirror, color unevenness may occur at the corners of the projected image. The amount of color unevenness can be reduced by changing the design of the curved mirror, but it takes time and effort due to the high degree of difficulty in optical design.

  An object of the present invention is to provide a projector capable of projecting a suitable projection image onto an installation surface without increasing the burden on optical design.

The projector of the present invention, a light source for emitting light, a display unit for displaying a projection image based on the image data, is projected from the light irradiated from the light source, projection of the displayed the projected image on the display unit and a direction deflected to the installation surface, and a mirror for correcting the projection area when projected on the installation surface in a rectangular shape, a projection image processing section for reducing the projection image, of the direction of projecting the projection image A reference plane that intersects with a component parallel to the installation plane, and the projection image processing unit projects the projection image in a state where the reference plane is in contact with a horizontal plane. The projected image is processed so that at least one side of the projection is parallel to the horizontal plane .

  According to the projector of the present invention, it is possible to project a suitable projection image onto the installation surface without increasing the burden on optical design.

It is a block diagram which shows the system configuration | structure of the projector which concerns on embodiment. It is sectional drawing which shows the structure of the projector unit which concerns on embodiment. It is a figure which shows the projection to the installation surface of the projector which concerns on embodiment. It is a figure which shows the projection to a horizontal surface with respect to the horizontal line of the projector which concerns on embodiment. It is a figure which shows the projection to a perpendicular surface with respect to the horizontal line of the projector which concerns on embodiment.

  A projector according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of the projector according to the embodiment. The projector 2 includes a CPU 4. The CPU 4 reduces the projection image displayed on the projector unit 6, the power switch 8, the operation unit 10, the image storage unit 12 that stores image data of the projection image, and the LCOS 40 described later. An image processing unit 14 that performs processing such as rotation and a battery 16 that supplies power to the projector unit 6 are connected.

  Here, the operation unit 10 includes a reproduction button 24 for instructing to start projection, a next image display button 26 for switching the projected image being projected to the next projected image, and a previous image for switching the projected image being projected to the previous projected image. A display button 28, a stop button 30 for instructing the end of projection, and a rotation button 32 for rotating a projection image being projected by a predetermined angle such as 90 ° by one operation.

  FIG. 2 is a sectional view showing the configuration of the projector unit according to the embodiment. Light emitted from an LED (light emitting diode) 34 that is a light source is made substantially parallel by a condenser lens 36 and enters a PBS (polarization beam splitter) 38.

  For example, as shown in FIG. 2, when the polarization separation film 38a provided on the PBS 38 at an angle of 45 ° with respect to the traveling direction of the incident light transmits only the S-polarized light, only the S-polarized light is incident on the LCOS 40. To do. Here, the liquid crystal layer (not shown) of the LCOS 40 functions as a phase plate for incident light when a voltage is applied. That is, light transmitted through a pixel region to which voltage is applied in a liquid crystal layer (not shown) of the LCOS 40 is converted from S-polarized light to P-polarized light, and light transmitted through a pixel region to which no voltage is applied proceeds as S-polarized light. .

  Then, the light incident on the LCOS 40 is reflected by the LCOS 40 and is incident on the PBS 38 again. Of the light incident on the PBS 38 again as mixed light of P-polarized light and S-polarized light, only the P-polarized light that has passed through the pixel region to which the voltage of the LCOS 40 is applied is reflected by the polarization separation film 38a and separated from the S-polarized light. The The P-polarized light is emitted upward from the PBS 38 and then projected through a projection lens 42 for projecting a projection image and a projection mirror 44 for deflecting the projection direction of the optical image emitted from the projection lens 42. Projected from the window 46.

  Here, the projection mirror 44 is composed of a curved mirror having a predetermined curvature so that trapezoidal correction can be performed on an image projected on the projection surface. As will be described later, in the projector 2 according to the present embodiment, when the projector 2 is installed on the installation surface, the projection distance of the image from the projection window 46 to the installation surface is uniquely determined. The optical member constituting the projector unit 6 can be fixed in advance at a predetermined position so that a clear image can be formed at a position separated by a distance.

  FIG. 3 is a diagram illustrating a projection state when the projector according to the embodiment is installed on the installation surface. The installation surface G may be a horizontal surface such as a desk or a vertical surface such as a white board.

  As shown in FIG. 3, when the projector 2 is installed on an installation surface G such as a desk or a whiteboard, the projection is performed so that at least one side of the projection region R having a rectangular shape is parallel to the projection direction. The image processing unit 14 rotates the projection image P read from the image storage unit 12 by about 45 ° with respect to the projection region R, and the projection image P occupies the maximum area in the projection region R in the rotated state. to shrink. Then, the projected image that has been rotated and reduced is displayed on the LCOS 40 and projected. At this time, all four sides of the projection image P intersect with the projection direction.

  For example, when the installation surface G of a desk, whiteboard, or the like is rectangular, the projection window 46 is in a state of facing the side H direction of the desk, whiteboard, etc. That is, the side H and the projection direction intersect. Accordingly, the projection region R having a rectangular shape is inclined with respect to the side H by a predetermined angle. Therefore, the image processing unit 14 rotates the projection image P read from the image storage unit 12 by approximately 45 ° with respect to the projection region R so that the side H is downward, and in the rotated state, the projection image R is projected within the projection region R. Reduce so that P occupies the largest area. Then, the projected image that has been rotated and reduced is displayed on the LCOS 40 and projected. At this time, all four sides of the projection image P intersect with the projection direction.

  Note that only the reduction processing may be performed without rotating the projection image P. In this case, the image processing unit 14 reduces the projection image P so that the projection image P is projected without using the four corners of the projection region R. Further, only the rotation process may be performed without reducing the projection image P.

  When the installation surface G is a vertical surface and the projector 2 includes an acceleration sensor that can measure two orthogonal axes, the inclination of the projection direction of the projector 2 with respect to the horizontal line is ± 45 ° and ± 135 °. You may alert | report by lighting the lamp | ramp (not shown) which consists of LED etc. which alert | reports that. In this case, the projection area R has a rectangular shape inclined by 45 ° with respect to the horizontal line. Therefore, the image processing unit 14 rotates the projection image P read from the image storage unit 12 by 45 ° so that the horizontal plane is downward, and the projection image P occupies the maximum area in the projection region R in the rotated state. Reduce to. Therefore, at least one side of the projection image P is parallel to the horizontal plane and is easy for the viewer to see.

  In this case, the LED 34 of the projector unit 6 may be turned on only when it is detected that the projector 2 is either ± 45 ° or ± 135 ° with respect to the horizontal line.

  FIG. 4 is a diagram illustrating a projection state when the projector according to the embodiment is installed on a horizontal plane with respect to a horizontal line. The projector 2 is installed at one corner of an installation surface G such as a desk that is a horizontal plane.

  When an instruction to start projection is given by the reproduction button 24, first, projection is performed so that the side S1 side is below the projected image so that the projected image is easy to see from the direction (1) shown in FIG. Here, in FIG. 4, the projector 2 is installed at the corner formed by the sides S2 and S3 of the installation surface G, and the projection direction forms a predetermined angle with the side S1 of the installation surface G. Accordingly, the projection region R has a rectangular shape inclined at a predetermined angle with respect to the side S1. Therefore, the image processing unit 14 rotates the projection image P read from the image storage unit 12 by 45 ° with respect to the projection region R so that the side S1 side is downward, and the projection image within the projection region R in the rotated state. Reduce so that P is maximized. Then, the projected image that has been rotated and reduced is displayed on the LCOS 40 and projected.

  Next, when an instruction to rotate the projection image is given by the rotation button 32, the image processing unit 14 rotates the projection image displayed on the LCOS 40 by 90 ° so that the projection image is easy to see from the direction (2) shown in FIG. Projection is performed so that the side S2 side is below the projection image P. In this state, when the rotation button 32 is used to instruct the rotation of the projection image, the projection image P is rotated by 90 ° to obtain a projection image that is easy to see from the direction (3) shown in FIG. Further, when a rotation instruction of the projection image P is given by the rotation button 32, a projection image that is easy to see from the direction (4) shown in FIG.

  FIG. 5 is a diagram showing projection when a projector is installed below the vertical plane. Between the back surface and the side surface of the projector 2, reference surfaces 48 and 50 having angles corresponding to the corners of the installation surface G are provided. Here, the reference planes 48 and 50 have an angle of 45 ° with respect to the projection direction. The reference planes 48 and 50 are provided with sensors (not shown) for detecting that they are in contact with the horizontal plane with respect to the horizontal line. The installation surface G is in contact with the horizontal plane M at the base L and intersects substantially vertically. When the reference plane 48 is in contact with the horizontal plane M and the bottom surface is in contact with the installation plane G, it is detected that the reference plane 48 is in contact with the horizontal plane M by a sensor (not shown). In this case, the projection region R is inclined by 45 ° with respect to the bottom side L of the installation surface G. When a projection start instruction is given by the playback button 24, the image processing unit 14 rotates 45 ° with respect to the projection image P read from the image storage unit 12 so that the base L side is below the projection image P, and the projection A process of reducing the projected image P so as to occupy the maximum area in the region R is performed. The processed projection image P is displayed on the LCOS 40 and projected as shown in FIG.

  When the reference plane 50 is in contact with the horizontal plane M and the bottom surface of the projector 2 is in contact with the installation plane G, it is detected that the reference plane 50 is in contact with the horizontal plane by a sensor (not shown). Is done. In this case, the image processing unit 14 rotates 45 ° with respect to the projection image P read from the image storage unit 12 so that the base L side is below the projection image P, and the projection image P within the projection region R. Is processed so as to occupy the maximum area, and projection is performed.

  According to the projector according to the present embodiment, it is possible to project a suitable projection image on the installation surface without increasing the burden on optical design. That is, by reducing the projection image, the four corners of the projection area are not used for projection of the projection image, and by rotating the reduced projection image, the area occupied by the projection image in the projection area is increased, which is preferable. Projection images can be projected.

  In addition, since the projection image can be installed at any of the four corners of the installation surface by rotating the projection image, the viewer can view the projection image at an easy-to-view position without entering the viewer's field of view. it can.

  In addition, since the angle of the reference plane provided between the back surface and the side surface of the projector corresponds to the angle of the installation surface, the projector can be installed according to the installation surface.

  In the embodiment described above, the image processing unit 14 rotates and reduces the projection image P and displays it on the LCOS 40. However, the LCOS 40 may be incorporated in the projector 2 in a state where the LCOS 40 is rotated by 45 °. In this case, it is not necessary to perform rotation processing by the image processing unit 14.

  In the above-described embodiment, the configuration in which the projected image being projected is rotated by 90 ° when the rotation button 32 is operated once has been described as an example. However, the projected image being projected is rotated by 180 ° by one operation. It is good also as composition to do.

DESCRIPTION OF SYMBOLS 2 ... Projector, 4 ... CPU, 6 ... Projector unit, 10 ... Operation part, 14 ... Image processing part, 32 ... Rotation button, 34 ... LED, 38 ... PBS, 40 ... LCOS, 44 ... Projection mirror, 46 ... Projection window 48, 50 ... reference plane, G ... installation plane, R ... projection area, P ... projection image

Claims (5)

A light source that emits light;
A display unit for displaying a projection image based on the image data;
The projection direction of the projected image displayed on the display unit projected by the light emitted from the light source is deflected to the installation surface, and the projection area when projected onto the installation surface is corrected to a rectangular shape. Mirror,
A projection image processing unit for reducing the projection image ;
A reference surface that intersects with a component parallel to the installation surface in a direction in which the projection image is projected,
The projection image processing unit is configured so that, when the projection image is projected in a state where the reference surface is in contact with a horizontal surface, at least one side of the projection image is parallel to the horizontal surface. A projector characterized by processing a projected image . The projection image processing unit rotates the projection image so that all four sides of the projection image projected on the installation surface intersect a component parallel to the installation surface in a direction in which the projection image is projected. The projector according to claim 1 . An inclination detector for detecting an inclination with respect to the horizontal plane;
On the basis of the inclination detected by the tilt detection unit, according to claim 1 or claim at least one side of the projected image, characterized in that it comprises a notification unit for notifying that it is parallel to the horizontal plane 2 Projector. The projector according to claim 2, characterized in that it comprises an image rotation button for rotation instruction of the projected image. The projector according to claim 4, wherein the image rotation button performs a rotation instruction to rotate the projection image by 90 ° or 180 ° by one operation.

Images