A display device includes a laser irradiation device and a control device. The laser irradiation device is configured to irradiate an irradiation point located at a display position in air, with a laser beam having a wavelength equal to or larger than 380 nm and equal to or smaller than 780 nm and produce plasma at the display position. The control device is configured to control intensity of the laser beam emitted from the at least one laser irradiation device so that a relationship between intensity of plasma light emitted from the plasma at the display position and intensity of scattered light produced from the laser beam and scattered by the plasma becomes a predetermined relationship to display a color pixel.

A method of controlling a display device is provided. The method includes a transparent screen to recognize a position of a user in front of the transparent screen and an eye gaze of the user looking at the transparent screen, recognize a position of a background object behind the transparent screen, estimate, based on a distance between the transparent screen and the user, and a direction of the eye gaze of the user, a minimum angular change of the eye gaze by which the display device is able to detect a change in the eye gaze, and display, on the transparent screen, information related to the background object when the background object is at a position within the minimum angular change of the eye gaze from a current eye gaze of the user.

An attraction system includes a sensor configured to determine a measured color property of a portion of an image projected by a projector onto a projection surface of the attraction system and a control system communicatively coupled to the sensor. The control system is configured to receive, from the sensor, data indicative of the measured color property and operate the attraction system based on a comparison between the measured color property and a target color property associated with the sensor.

A manufacturing method of a 3D stereoeffect sign includes designing a figure or a character having specific information, giving a volume to the figure or the character by providing one or more vanishing points, setting a projection height of the figure or the character having the volume which is projected to the eyes of a viewer which is located at a reference distance, setting a printed length of the figure or the character having the volume to correspond to the projection height, setting a printed width of the figure or the character having the volume, and adjusting the length and the width of the figure or the character having the volume proportionally to correspond to the printed length and the printed width.

In one aspect, a method includes the step of A mobile projection system; the system comprising: a hermetically sealed base unit configured to be releasably attached to an automobile; a microprocessor configured to receive a plurality of projectable images from a remote server over a wireless network; and a remote server configured to store a plurality of selected images over a period of time; a projection means configured to project a selected image through a translucent lens.

A spray device (A) according to the present disclosure includes: a two-fluid nozzle (11) which sprays a mist (91); a spray-device-side gas flow path (12) for supplying a gas to the two-fluid nozzle (11); a gas supply source (17) which supplies the gas to the spray-device-side gas flow path (12); a spray-device-side liquid flow path (13) for supplying a liquid to the two-fluid nozzle (11); a liquid supply source (18) which supplies the liquid to the spray-device-side liquid flow path (13); a pulse-driven liquid flow control valve (14) having a valve opening degree that is adjusted according to a pulse signal to control the flow rate of the liquid in the spray-device-side liquid flow path (13); and a controller (30) which adjusts, in multiple levels, the concentration of the mist (91) sprayed from the two-fluid nozzle 11 by adjusting the valve opening degree of the liquid flow control valve 14.

A light symbol projection device is disclosed. The light symbol projection device has a housing which is temporarily secured within a receiving mechanism. The receiving mechanism is embedded within a product such as, for example, a shoe. The light symbol housing may project, in various colors, a word, pattern, symbol, logo or other indicia on the ground. The light symbol housing may be interchangeable so that the receiving mechanism may receive various light symbol housings having different light projections. In one embodiment, a speaker associated with the device may also provide an audible sound.

The invention relates to a safety corridor arrangement for use in emergency situations, including an activation means, an operation means, associated with an activation centre, and a safety corridor suitable to guide or direct a person on a particular pathway. The activation centre, through activation of the activation means can cause operation of the operation means, and the operation means creates the safety corridor to guide a person along the safety corridor towards an exit. The invention also relates to a point of exit arrangement, and methods of use.

A high efficiency traffic sign includes a retroreflective film and a diffuser film. The retroreflective film is located between the body of the traffic sign and the diffuser film so as to form an indication face. The traffic sign is located higher than a road and the indication face faces coining vehicles on the road. A projection light source module is located on one side of the road and emits a light beam toward the traffic sign and the light beam covers the indication face. The light beam passes through the diffuser film and reaches retroreflective film. The light beam is then reflected and passes through the diffuser film again, the diffuser film changes the reflective path of the light beam which passes through the diffuser film to form a diversified light beam to allow the drivers of the coining vehicles on the road to see the traffic sign clearly.

An aircraft projection device includes a projector that displays an image by projecting the image onto a floor surface of a passage in an interior of an aircraft; and a controller that controls the projector to display the image onto the floor surface of the passage in the interior of the aircraft.