CN-115903351-B - Projection device and control method thereof

CN115903351BCN 115903351 BCN115903351 BCN 115903351BCN-115903351-B

Abstract

A projection apparatus and a control method of the projection apparatus. The scanning frequency is reduced. A projection device includes a light-emitting display panel in which a plurality of pixels each having a light-emitting element are arranged in a matrix, a scanning mirror that reflects image light emitted from the light-emitting display panel toward a surface to be scanned and scans the reflected image light on the surface to be scanned in 2 dimensions, and a projection optical system that guides the image light from the light-emitting display panel to the scanning mirror.

Inventors

TAKEDA TAKASHI

Assignees

精工爱普生株式会社

Dates

Publication Date: 20260508
Application Date: 20220927
Priority Date: 20210930

Claims (5)

1. A projection device, comprising: a light-emitting display panel in which a plurality of pixels each having a light-emitting element are arranged in a matrix; a scanning mirror that reflects image light emitted from the light-emitting display panel toward a scanned surface, and scans the reflected image light 2-dimensionally on the scanned surface, and A projection optical system that guides the image light from the light emitting display panel to the scanning mirror, The projection device has a control section that controls the light emitting display panel and the scanning mirror, The control section controls the rotation movement of the scanning mirror so that a scanning point on the scanned surface moves on a prescribed scanning path, and controls the light-emitting display panel so that the image light is emitted when the scanning point reaches each of a plurality of image display points set on the scanning path, The control section divides an input image into a plurality of sub-images, controls the light-emitting display panel in such a manner that the image light representing the sub-image corresponding to the image display point that has arrived is emitted when the scanning point arrives at each of the plurality of image display points set on the scanning path, Adjacent ones of the plurality of sub-images have overlapping areas as areas overlapping each other, In the sub-image, the luminance gradually decreases from the boundary of the overlapping region and the other region toward the edge of the overlapping region.
2. The projection apparatus according to claim 1 wherein, The control unit controls the rotation of the scanning mirror so that the scanning point moves at a constant speed in a section of 2 adjacent image display points and stops for a predetermined time at the image display point that has arrived, and controls the light-emitting display panel so that the image light is emitted at the scanning point for the predetermined time at which the image display point has stopped.
3. The projection apparatus according to claim 1 wherein, The control section controls the light emitting display panel in such a manner that the scanning point moves on the scanning path at a constant speed, and in such a manner that the image light is emitted when the scanning point reaches each of the plurality of image display points set on the scanning path.
4. The projection apparatus according to any one of claims 1 to 3, wherein, The projection device includes an fθ lens for imaging the image light reflected by the scanning mirror on the scanned surface.
5. A control method of a projection device includes a light emitting display panel in which a plurality of pixels having light emitting elements are arranged in a matrix, a scanning mirror, and a projection optical system that guides image light from the light emitting display panel to the scanning mirror, The scanning mirror reflects the image light emitted from the light-emitting display panel toward a scanned surface, scans the reflected image light 2-dimensionally on the scanned surface, The control method comprises the following steps: Controlling the rotational movement of the scanning mirror in such a way that a scanning point on the scanning surface moves over a prescribed scanning path, and The light emitting display panel is controlled in such a manner that the image light is emitted when the scanning point reaches each of a plurality of image display points set on the scanning path, In the step of controlling the light emitting display panel, an input image is divided into a plurality of sub-images, the light emitting display panel is controlled in such a manner that when the scanning point reaches each of the plurality of image display points set on the scanning path, the image light representing the sub-image corresponding to the reached image display point is emitted, Adjacent ones of the plurality of sub-images have overlapping areas as areas overlapping each other, In the sub-image, the luminance gradually decreases from the boundary of the overlapping region and the other region toward the edge of the overlapping region.

Description

Projection device and control method thereof Technical Field The present invention relates to a projection apparatus and a control method of the projection apparatus. Background Patent document 1 discloses a projection display device that projects an image by a linear laser array and a scanner. Patent document 1 Japanese patent application laid-open No. 2011-169988 Since the scan angle of the scanner is inversely related to the scan frequency, the scan frequency decreases when the scan angle is increased in order to display a large screen. That is, the frame rate of the video decreases. In addition, when the longitudinal (Y-axis) dimension of the image becomes large, the longitudinal dimension of the scanner becomes large, and the optical system becomes large. For example, about 2000 pixels are required in the vertical direction for display of a 4k image. In this case, even if the longitudinal dimension of the pixel is 2 μm, a panel having a longitudinal dimension of 4mm is required, and as the panel size is enlarged, the size of the scanner becomes larger. Disclosure of Invention In order to solve the above problems, a projection device according to one embodiment of the present invention includes a light-emitting display panel in which a plurality of pixels each having a light-emitting element are arranged in a matrix, a scanning mirror that reflects image light emitted from the light-emitting display panel toward a surface to be scanned, and scans the reflected image light in 2 dimensions on the surface to be scanned, and a projection optical system that guides the image light from the light-emitting display panel to the scanning mirror. The control method of a projection device according to one embodiment of the present invention includes a light-emitting display panel in which a plurality of pixels each having a light-emitting element are arranged in a matrix, a scanning mirror, and a projection optical system that guides image light from the light-emitting display panel to the scanning mirror, wherein the scanning mirror reflects the image light emitted from the light-emitting display panel toward a surface to be scanned, and scans the reflected image light in 2 dimensions on the surface to be scanned. Drawings Fig. 1 is a diagram schematically showing an overall image of a projection apparatus in an embodiment of the present invention. Fig. 2 is a diagram schematically showing a main part structure of the projection apparatus. Fig. 3 is a schematic configuration diagram showing the overall structure of a light-emitting display panel provided in a projection apparatus. Fig. 4 is an equivalent circuit diagram showing an example of a circuit configuration of each pixel provided on the light-emitting display panel. Fig. 5 is a diagram schematically showing an example of a mechanical configuration of a MEMS scanner having a scanning mirror. Fig. 6 is a diagram schematically showing a relationship between a rotation angle θ of the scanning mirror about the Y axis and a position of a scanning point on the scanned surface. FIG. 7 is a schematic illustration of the rotation angle of the scan mirror about the X-axisA graph of the relationship with the position of the scanning point on the scanned surface. Fig. 8 is a diagram showing a scannable area scannable by a scan mirror in an in-plane area of a scanned surface. Fig. 9 is a diagram showing an example of a scanning path set in a scannable area of a scanned surface. Fig. 10 is a diagram showing an example of an input image. Fig. 11 is a timing chart showing a temporal correspondence relationship between the X-direction position of a scanning point and the light emission amount of a light-emitting display panel in the step-and-scan mode. Fig. 12 is a diagram showing a case where sub-images are sequentially formed on a scanned surface by scanning points through respective image display points set on a scanning path in a step-and-scan mode. Fig. 13 is an explanatory diagram 1 of an overlapping area provided in a sub-image. Fig. 14 is an explanatory diagram of the overlapped area provided in the sub-image 2. Fig. 15 is a 3 rd explanatory diagram of an overlapping region provided in a sub-image. Fig. 16 is a 4 th explanatory diagram of an overlapping region provided in a sub-image. Fig. 17 is a diagram showing a state in which sub-images are sequentially formed on a scanned surface by scanning points passing through respective image display points set on a scanning path in the continuous scanning mode. Fig. 18 is a timing chart showing the time correspondence relationship between the X-direction position of the scanning point, the main scanning rotation angle θ of the scanning mirror 4, and the light emission amount of the light emitting display panel in the continuous scanning mode. Fig. 19 is a diagram schematically showing an example of a mechanical structure of a MEMS scanner capable of realizing a step-and-scan mode operation on the mechanical structure. Fi