An embodiment provides an electronic device, including: a support arm; a base portion connected to one end of the support arm; a head portion connected to the other end of the support arm; a projector disposed within the head portion; and a projector adjustment element that adjusts an image projected by the projector; wherein a portion of the projector adjustment element is exposed on an underside of the head portion. Other embodiments are described and claimed.

An embodiment provides an electronic device, including: a support arm; a base portion connected to one end of the support arm; a head portion connected to the other end of the support arm; a projector disposed within the head portion; and a projector adjustment element that adjusts an image projected by the projector; wherein a portion of the projector adjustment element is exposed on an underside of the head portion. Other embodiments are described and claimed.

An embodiment provides an electronic device, including: a support arm; a base portion connected to one end of the support arm; a head portion connected to the other end of the support arm; a projector disposed within the head portion; and a projector adjustment element that adjusts an image projected by the projector; wherein a portion of the projector adjustment element is exposed on an underside of the head portion. Other embodiments are described and claimed.

An embodiment provides an electronic device, including: a support arm; a base portion connected to one end of the support arm; a head portion connected to the other end of the support arm; a projector disposed within the head portion; and a projector adjustment element that adjusts an image projected by the projector; wherein a portion of the projector adjustment element is exposed on an underside of the head portion. Other embodiments are described and claimed.

According to the present disclosure, a projector lift is provided to raise and lower a projector from the ceiling. The projector lift includes a ceiling mount normally coupled to the ceiling, a projector mount supporting the projector, a lift assembly configured to raise and lower the second mount and projector, and a stabilizer extending between the ceiling and projector mounts.

An image display method includes displaying, on a display surface, a first image based on first image data from a first input source; and establishing a correspondence between a feature of a first marker and the first input source when it is detected that the first marker is placed in a detection area included in the display surface while the first image is displayed on the display surface.

An image display method includes displaying, on a display surface, a first image based on first image data from a first input source; and establishing a correspondence between a feature of a first marker and the first input source when it is detected that the first marker is placed in a detection area included in the display surface while the first image is displayed on the display surface.

Disclosed herein is provided is a visual presenter having a head structure capable of changing a photographing direction, the visual presenter including a base fixed to a floor by applying weight to prevent the presenter from falling down, a head part having one end provided with a camera lens facing the floor, a support part connecting the head part and the base and extending upward from the base to position the head part at a height of a learner's face, and a photographing mode switching module disposed adjacent to the camera lens and configured to switch between a learner photographing mode and a study material photographing mode without requiring manipulation of the head part.

Disclosed herein is provided is a visual presenter having a head structure capable of changing a photographing direction, the visual presenter including a base fixed to a floor by applying weight to prevent the presenter from falling down, a head part having one end provided with a camera lens facing the floor, a support part connecting the head part and the base and extending upward from the base to position the head part at a height of a learner's face, and a photographing mode switching module disposed adjacent to the camera lens and configured to switch between a learner photographing mode and a study material photographing mode without requiring manipulation of the head part.

Coated surfaces arranged in a stack assume a periodic formation having a sequence of segments including a first segment. The first segment has first, second, and third coated surfaces, and is repeated a set number of times to form the periodic formation. The stack is sliced to form a slice having two major external surfaces and adjacent sections each having coated surfaces from one segment between the two major external surfaces. The slice is cut to form at least one substrate from each section. Each substrate has two major surfaces and coated surfaces from a single segment of the periodic formation between the two major surfaces. In certain embodiments, the first coated surface reflects a first light color, the second coated surface transmits the first light color and reflects a second light color, and the third surface reflects a third light color and transmits the first and second light colors.