Seereal Technologies S.a.

Hseb Dresden Gmbh

Unity Semiconductor Corporation

Stanislas Flon

Armin Schwerdtner

Bernd Srocka

Philippe Renaud-Goud

Jean-Christophe Olaya

A method and assembly for determining the thickness of layers of a sample stack influencing the intensity of reflected light from a light source. The thickness is determined from the intensity detected by an array detector with a plurality of detector elements in lines and columns. The detector comprises a plurality of sections in the form of parallel stripes, the stripes detecting the light reflected by the sample stack of layers simultaneously. Light of one selected wavelength range only is detected by each of the plurality of sections of the detector. The image of the sample stack on the detector or of the parallel stripes is moved in a direction perpendicular to the longitudinal direction of the parallel stripes such that each point of the sample stack is detected at least once in each of the different wavelength ranges.

Method and assembly for determining the thickness of a layer in a sample stack

A holographic projection system with a display screen and an optical wave tracking element for controlling the direction of propagation of a modulated wave uses a position controller and an eye finder. An extremely wide tracking range is realized in the projection system for simultaneous viewing of the reconstruction by multiple observers, which are situated beside one another. The reconstruction of the scene is reconstructed for each eye position of an observer such that the entire scene is visible in the visibility region in a large tracking range with minimal errors. The projection system reconstructs the scene with the help of modulated partial waves. Projection element(s) direct these partial waves with separately holographically reconstructed segments of the scene at the desired eye position through a structure of screen segments which are at least horizontally staggered on the display screen.

Holographic projection system with optical wave tracking and with means for correcting the holographic reconstruction

The invention relates to a method and a playback device for a two- and/or three-dimensional illustration, having at least one light source, at least one light modulation device, a display screen, and a tracking system for tracking a virtual viewer window of a viewer plane, in which at least one viewer is located. This tracking system has a position detection system for determining the eye positions of the at least one viewer in the viewer plane, a tracking device, and a control device for activating and controlling the tracking device, and is disposed between the light modulation device and the display screen. In order to track the viewer window along an optical axis of the playback device, a focal width on the image side of an optical system of the tracking device is constant.

Growing community of inventors

Dresden, Germany

Stanislas Flon