A projection system includes a screen forming device configured to form a screen by ejecting liquid from a plurality of nozzles and a projector, acquires three-dimensional shape data formed by a three-dimensional coordinate system having an X axis, a Y axis, and a Z axis, divides the three-dimensional shape data in an X-axis direction to generate sectional shape data, acquires coordinates of the sectional shape data, executes matching processing for correlating the coordinates of the sectional shape data, pixels with which the projector draws an image, the nozzles of the screen forming device, and heights in an ejection space of the liquid ejected from the nozzles, and projects an image onto the screen according to the correlation by the matching processing.

A projection optical system of an image display apparatus that includes a lens system and a concave reflection surface. The lens system is has a positive refractive power as a whole. The concave reflection surface reflects the image light emitted from the lens system toward an object. The projection optical system is configured such that a relationship 0<|Δθ(hmax) Δθ(0.9.Math.hmax)|/θ(hmax)<0.056 is satisfied, where a light beam height from the reference axis is h, an angle with respect to an optical axis height direction of a tangent line of a function Z(h) representing a shape of the concave reflection surface corresponding to the light beam height h is θ(h), an amount of change in the angle θ(h) is Δθ(h), and the light beam height h of a reflection point farthest from the reference axis of the concave reflection surface for reflecting the image light is hmax.

A projection optical system of an image display apparatus that includes a lens system and a concave reflection surface. The lens system is has a positive refractive power as a whole. The concave reflection surface reflects the image light emitted from the lens system toward an object. The projection optical system is configured such that a relationship 0<|Δθ(hmax) Δθ(0.9.Math.hmax)|/θ(hmax)<0.056 is satisfied, where a light beam height from the reference axis is h, an angle with respect to an optical axis height direction of a tangent line of a function Z(h) representing a shape of the concave reflection surface corresponding to the light beam height h is θ(h), an amount of change in the angle θ(h) is Δθ(h), and the light beam height h of a reflection point farthest from the reference axis of the concave reflection surface for reflecting the image light is hmax.

The present invention may provide a screen used for screen golf, which can improve the brightness and clarity of the image projected on the screen by suppressing the light of the image from passing through the screen and increasing the reflectance of light from the front of the screen when an image is output by a projector on the screen. In addition, despite repeated golf shots of many users, the brightness and clarity of the image projected on the screen may not be damaged.

The present invention may provide a screen used for screen golf, which can improve the brightness and clarity of the image projected on the screen by suppressing the light of the image from passing through the screen and increasing the reflectance of light from the front of the screen when an image is output by a projector on the screen. In addition, despite repeated golf shots of many users, the brightness and clarity of the image projected on the screen may not be damaged.

A head mounted display device includes a display panel and a lens assembly mounted so that an optical axis of the lens assembly intersects the display panel. The lens assembly includes a lens body having a surface facing the display panel and defining Fresnel prisms. A Fresnel prism of the Fresnel prisms has a first facet angle when viewed in a first cross-section and has a second facet angle when viewed in a second cross-section parallel to the first cross-section. The first facet angle is different than the second facet angle.

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 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 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.