US 12,724,338 B2Granted

Projection apparatus and projecting method

AssigneeQisda Corporation

InventorsTe-Yuan Li, Chih-Wei Cho

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Abstract

A projection apparatus configured to project an image frame onto a projected plane is provided. The projection apparatus includes an image source, a projection lens, a time-of-flight ranging sensor (ToF ranging sensor), and a controller. The image source is configured to emit an image beam. The projection lens is configured to project the image beam onto the projected plane to form the image frame. The ToF ranging sensor is configured to measure a distance from the projected plane. The controller is configured to set a sampling range of the ToF ranging sensor and obtain a plurality sets of distance information of measured points on the projected plane by moving the sampling range of the ToF ranging sensor, and adjust a focal distance of the projection lens according to the sets of distance information through the controller. A projecting method is also provided.

Claims16

Dependent claims

A projection apparatus, configured to project an image frame onto a projected plane, the projection apparatus comprising:

an image source, configured to emit an image beam;
a projection lens, disposed on a light path of the image beam, and configured to project the image beam onto the projected plane to form the image frame;
a time-of-flight (ToF) ranging sensor, configured to measure a distance from the projected plane;
and
a controller, electrically connected to the ToF ranging sensor and the projection lens, wherein the controller is configured to set a sampling range of the ToF ranging sensor, obtain a plurality of sets of distance information of measured points on the projected plane by moving the sampling range of the ToF ranging sensor to different positions, and adjust a focal distance of the projection lens according to the sets of distance information through the controller,
wherein setting the sampling range of the ToF ranging sensor comprises respectively setting a plurality types of sampling windows of the ToF ranging sensor, and the controller is configured to obtain the sets of distance information by respectively moving the plurality types of sampling windows to different positions, wherein the plurality types of sampling windows have different sizes or coverage ranges of a plurality of sampling pixels of the multiple types of sampling windows are different.

3 more elements

A projecting method, comprising:

providing a projection apparatus, wherein the projection apparatus comprises an image source, a projection lens, and a time-of-flight (ToF) ranging sensor, the image source is configured to emit an image beam, the projection lens is disposed on a light path of the image beam, and is configured to project the image beam onto a projected plane to form an image frame, the ToF ranging sensor is configured to measure a distance from the projected plane;
setting a sampling range of the ToF ranging sensor by using a controller;
obtaining a plurality of sets of distance information of measured points on the projected plane by moving the sampling range of the ToF ranging sensor to different positions by using the controller;
and
adjusting a focal distance of the projection lens according to the sets of distance information through the controller,
wherein setting the sampling range of the ToF ranging sensor comprises respectively setting a plurality types of sampling windows of the ToF ranging sensor, and moving the sampling range of the ToF ranging sensor to different positions comprises obtaining the sets of distance information by respectively moving the plurality types of sampling windows to different positions by using the controller, wherein the plurality types of sampling windows have different sizes or coverage ranges of a plurality of sampling pixels of the multiple types of sampling windows are different.

3 more elements

Dependencies are inferred from the claim text.