Auto-focus method for projector, projector, and non-transitory computer-readable storage medium

A projector, comprising a distance measuring component, a memory, a processor, a focus motor and a lens module, wherein

• the distance measuring component is configured to output distance measurement data related to a distance between the projector and a projection screen;
• the memory is configured to store an executable program;
• the processor is configured to execute the program stored in the memory to cause the processor to perform the following operations:
• calculating a projection distance based on the distance measurement data;
• calculating a size of an image projected by the projector based on the projection distance according to a throw ratio of the lens module;
• calculating a driving parameter of the focus motor based on the size of the image according to characteristics of the focus motor and the lens module;
• and
• controlling the focus motor to drive the lens module to move based on the driving parameter of the focus motor, and achieving auto-focus.

A non-transitory computer-readable storage medium storing a program instruction;

• wherein the program instruction is configured to enable a processor to perform an auto-focus method for a projector;
• wherein the auto-focus method comprises:
• calculating a projection distance based on measurement data from a distance measuring component of the projector;
• calculating a size of an image projected by the projector based on the projection distance according to a throw ratio of a lens module of the projector;
• calculating a driving parameter of a focus motor based on the size of the image according to characteristics of the focus motor and the lens module of the projector;
• and
• controlling the focus motor to drive the lens module to move based on the driving parameter of the focus motor, and achieving auto-focus.