Projection apparatus and auto-focusing method
AssigneeCoretronic Corporation
InventorsTZU-HAI CHUNG, WEN-CHANG CHIEN, YU-CHI WU
Life of this patent
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Abstract
A projection apparatus includes a light valve, a lens module, a distance measuring module, a lens position detection module and a processor. The light valve forms an image beam. The lens module projects the image beam onto a display surface. The distance measuring module detects a distance between the lens module and the display surface to obtain a first distance value. The lens position detection module detects a position of the lens module to obtain a second distance value. The processor receives the first distance value from the distance measuring module, receives the second distance value from the lens position detection module and obtains an effective focus range according to the second distance value.
Claims18
A projection apparatus, comprising:
- a light valve adapted to form an image beam;
- a lens module adapted to project the image beam onto a display surface;
- a distance measuring module adapted to detect a distance between the lens module and the display surface to obtain a first distance value;
- a lens position detection module adapted to detect a position of the lens module to obtain a second distance value;
- and
- a processor electrically connected to the distance measuring module and the lens position detection module, wherein the processor receives the first distance value from the distance measuring module, receives the second distance value from the lens position detection module, and obtains an effective focus range according to the second distance value, wherein when the processor determines that the first distance value is outside the effective focus range, the processor drives the lens module so that the first distance value enters the effective focus range.
An auto-focusing method for adjusting a distance between a projection apparatus and a display surface, the projection apparatus comprising a light valve, a lens module, a distance measuring module, a lens position detection module and a processor, and the auto-focusing method comprising steps of:
- configuring the processor to receive a first distance value from the distance measuring module and a second distance value from the lens position detection module, wherein the first distance value is a distance between the lens module and the display surface, and the second distance value is a position of the lens module;
- obtaining an effective focus range according to the second distance value;
- determining whether the first distance value is within the effective focus range;
- and
- when the processor determines that the first distance value is outside the effective focus range, configuring the processor to drive the lens module so that the first distance value enters the effective focus range.
Dependencies are inferred from the claim text.