An LED driver circuit capable of overcoming the issues in that a brightness change is perceived as a stepped change in a very low light amount region or light abruptly goes out by using PWM control and of realizing smooth dimming even at a very low amount of light is provided. In the LED driver circuit, a first circuit including a first resistor and a first power transistor connected in series and a second circuit including a second resistor and a second power transistor connected in series are connected in parallel with each other and are connected to an LED. First and second PWM signal generator circuits drive the first and second power transistors, respectively. When the first and second power transistors are in an on-state, currents flow through the LED via the first and second resistors, respectively, which enable a smooth brightness change even in a low illuminance region.

An LED driver circuit capable of overcoming the issues in that a brightness change is perceived as a stepped change in a very low light amount region or light abruptly goes out by using PWM control and of realizing smooth dimming even at a very low amount of light is provided. In the LED driver circuit, a first circuit including a first resistor and a first power transistor connected in series and a second circuit including a second resistor and a second power transistor connected in series are connected in parallel with each other and are connected to an LED. First and second PWM signal generator circuits drive the first and second power transistors, respectively. When the first and second power transistors are in an on-state, currents flow through the LED via the first and second resistors, respectively, which enable a smooth brightness change even in a low illuminance region.

Some embodiments of the invention are directed toward a robotic head that includes a head enclosure; a translucent face mask coupled with the head enclosure, having a front side and a rear side; a neck system coupled with the head enclosure and configured to move the head enclosure; and a projector coupled with the head enclosure and disposed to project images of a face onto the rear side of the face mask.

Some embodiments of the invention are directed toward a robotic head that includes a head enclosure; a translucent face mask coupled with the head enclosure, having a front side and a rear side; a neck system coupled with the head enclosure and configured to move the head enclosure; and a projector coupled with the head enclosure and disposed to project images of a face onto the rear side of the face mask.

A display system comprises a projector combined with a retro reflective screen and a viewer distance from the projector such that the observation angle is less than approximately 2-3 degrees. The brightness of the image on the screen for the proposed display system is increased by a factor of ˜100-500× as compared to traditional display systems with for an equivalent power/intensity light source.

A display system comprises a projector combined with a retro reflective screen and a viewer distance from the projector such that the observation angle is less than approximately 2-3 degrees. The brightness of the image on the screen for the proposed display system is increased by a factor of ˜100-500× as compared to traditional display systems with for an equivalent power/intensity light source.

A display apparatus includes a screen formed in an arcuate shape centering on a center axis and a projection device configured to project, along projecting directions orthogonal to the center axis and different from one another, images corresponding to the projecting directions on the inner circumferential surface or the outer circumferential surface of the screen. The screen includes a retroreflective layer having a reflection surface directed to the projection device and a diffusion layer arranged on the projection device side with respect to the retroreflective layer and configured to diffuse, when transmitting light made incident from the retroreflective layer, the light wider in a first direction along the center axis than in a second direction, which is a circumferential direction centering on the center axis.

A display apparatus includes a screen formed in an arcuate shape centering on a center axis and a projection device configured to project, along projecting directions orthogonal to the center axis and different from one another, images corresponding to the projecting directions on the inner circumferential surface or the outer circumferential surface of the screen. The screen includes a retroreflective layer having a reflection surface directed to the projection device and a diffusion layer arranged on the projection device side with respect to the retroreflective layer and configured to diffuse, when transmitting light made incident from the retroreflective layer, the light wider in a first direction along the center axis than in a second direction, which is a circumferential direction centering on the center axis.

Provided herein are systems and methods to configure an immersive theater environment by moving one or more screens. A movie screen can be provided with one or more actuators coupled to the movie screen, wherein the one or more actuators are configured to move the movie screen in a plurality of directions including, for example, up, down, left, right, back, forward, pitch, roll, and yaw. This system can include a processor coupled to the actuator, wherein the processor is configured to control the movement of the one or more actuators, synchronize cinema content for movement of the movie screen, process cinema content for metadata cues indicating movement of the movie screen, and track positions of the movie screen.

Provided herein are systems and methods to configure an immersive theater environment by moving one or more screens. A movie screen can be provided with one or more actuators coupled to the movie screen, wherein the one or more actuators are configured to move the movie screen in a plurality of directions including, for example, up, down, left, right, back, forward, pitch, roll, and yaw. This system can include a processor coupled to the actuator, wherein the processor is configured to control the movement of the one or more actuators, synchronize cinema content for movement of the movie screen, process cinema content for metadata cues indicating movement of the movie screen, and track positions of the movie screen.