Patent ID: 7891822
Filing Date: 2011-02-22
Classification: G03B,H04N

Abstract:
1. A handheld projection system comprising: a projection device for projecting an image onto a projection surface, wherein the projection device has at least two drive power modes associated with different qualities of the projected image, wherein the different qualities comprise minimal, intermediate, and maximal image quality, and the handheld projection system further comprises a microprocessor configured to implement a selection device for selecting one of said at least two drive power modes on the basis of a currently selected power source of the handheld projection system, wherein the currently selected power source comprises one of (a)(i) an internal power source internal to the projection system that includes a drive unit for use with the internal power source and (a)(ii) an external power source external to the projection system that includes a distinct drive unit for use with the external power source, wherein a respective drive unit of the currently selected power source is configured (b)(i) to control image generation of said projection device and (b)(ii) to operate the projection device at the corresponding drive power mode, so that the quality of the projected image is adjusted on the basis of the power source of the handheld projection system via the respective drive unit of the currently selected power source, wherein the external power source is an add-on battery, wherein said add-on battery is incorporated in an add-on battery pack, and said add-on battery pack further comprises the distinct drive unit for use with the external power source arranged to drive the projection device at the drive power mode selected by the selection device when said add-on battery is the currently selected power source.