An optical projection system includes a light source module, an optical engine, a thermoelectric generator, a storage unit, a plurality of electronic devices, and a selection unit. The light source module is capable of emitting at least one light beam, and the optical engine receives the light beam and modulates the light beam according to at least one image signal to form an image beam. The thermoelectric generator absorbs heat in the optical projection system and converts the heat into electrical energy, and the storage unit stores the electrical energy. The electronic devices receive the electrical energy stored in the storage unit and have at least two different threshold voltages. The selection unit selectively turns on at least one of electronic devices according to a state of charge of the storage unit.

A light pattern projector with a pattern mask to spatially modulate an intensity of a wideband illumination source, such as an LED, and a projector lens to reimage the spatially modulated emission onto regions of a scene that is to be captured with an image sensor. The projector lens may comprise a microlens array (MLA) including a first lenslet to reimage the spatially modulated emission onto a first portion of a scene, and a second lenslet to reimage the spatially modulated emission onto a first portion of a scene. The MLA may have a fly's eye architecture with convex curvature over a diameter of the projector lens in addition to the lenslet curvature. The pattern mask may be an amplitude mask comprising a mask pattern of high and low amplitude transmittance regions. In the alternative, the pattern mask may be a phase mask, such as a refractive or diffractive mask.

A projection optical system includes a first lens unit and a second lens unit interposing an intermediate image therebetween. The first lens unit includes two aspherical lenses (a first lens unit first lens and a first lens unit ninth lens), and a first lens unit cemented lens. The projection optical system satisfies the following Conditional Expressions (1) and (2) when the number of lens elements of the first lens unit and the number of lens elements of the second lens unit are set to be Num1 and Num2, respectively. In addition, refractive indexes and Abbe numbers of three lenses constituting the first lens unit cemented lens satisfy a predetermined conditional expression.

Num27(1)

1.5Num1/Num22.5(2)

A projector, an image projection method, and a recording medium storing a program. The projector includes a color wheel configured to divide light by time into light rays of a plurality of colors including at least a first color and a second color, the light forming an image to be projected, an image generator configured to generate the image including a plurality of pixels from the light rays divided by time by the color wheel, a shifting member configured to shift the plurality of pixels of the image formed by the first color and the second color, with varying shifting speeds, a color-wheel controller configured to control the color wheel, a shifting controller configured to control the shifting member, and a timing controller configured to generate a first timing signal for controlling timings of the color wheel and a second timing signal for controlling timings of the shifting member.

An image projection apparatus includes processing circuitry that receives, for each surface of a plurality of surfaces in a projection region, an adjustment value to increase or decrease an effective distance from an imaging device to a curved position of the surface. The processing circuitry further determines, for each surface, a curved shape of the surface in accordance with a change of distortion corresponding to the effective distance that was increased or decreased by the received adjustment value. The processing circuitry further calculates, for each surface, correction parameters to correct the distortion of projection images projected onto the surface, in accordance with the determined curved shape of the surface. The processing circuitry further divides an image into a plurality of divided images in accordance with positions and sizes of the each surface of the plurality of surfaces in the projection region.

A dynamic display projection lamp of the present invention includes plural projection units fixed to a fixing assembly. The fixing assembly includes a lens holder and a film holder for fixing a film. A plurality of penetrating holes are defined in the lens holder, and clamping grooves for clamping plural lenses of plural lens groups are formed in inner walls defining the penetrating holes. The film holder is fixed in the lens holder or at least a portion of the film holder is inserted between the lenses through an opening of the lens holder. All the projection units disposed in a single row or two rows up and down are fixed by using the lens holder and the film holder. The projection units are allowed to project patterns in sequence by using a controller, thus producing a dynamic pattern projection effect.

A locally dimmed display has a spatial light modulator illuminated by a light source. The spatial light modulator is illuminated with a low resolution version of a desired image. The illumination may comprise a series of lighting elements that vary smoothly from one element to another at the spatial light modulator.

A projector includes a projection unit that projects a projection image and a control unit that performs calibration. The control unit detects a position of a first detection point in a first symbol, from a first captured image obtained by capturing a first projection image when the projection unit projects the first projection image including the first symbol onto a projection surface, detects a position of a second detection point in a second symbol, based on the position of the first detection point, from a second captured image obtained by capturing a second projection image when the projection unit projects the second projection image including the second symbol onto the projection surface, and performs the calibration based on the position of the second detection point. The second symbol is disposed at a position corresponding to the first symbol and has a shape different from the first symbol.

A projector projects an image on an object in a focus-free manner. The projector includes a transmissive spatial light modulator (20) that forms a two-dimensional pattern for defining the image; and a laser light source (10) that irradiates the spatial light modulator (20) with laser light (30). The spatial light modulator (20) generates a bundle of a plurality of light beams (300), having a spatial intensity distribution of the two-dimensional pattern, from the laser light (30).

A system comprising: a handheld mobile device comprising: a projector unit configured to project an image; a camera; and a prism configured to reflect the image projected by the projector such that the camera can capture the projected image.