A display panel and a display device are provided. The display panel comprises a central region and peripheral regions. The peripheral regions are provided at two opposite ends of the display panel and have a first curvature; the central region is provided between the two opposite ends of the display panel and has a second curvature; and the second curvature of the central region is smaller than the first curvature of the peripheral regions.

Display panel and display device

High-speed three-dimensional shape measurement using GOBO projection

Three-dimensional (3-D) measurement systems based on coded-light techniques are conventionally limited by the projection speed, which is typically in the range of a few 100 Hz, resulting in 3-D frame rates of 1 to 60 Hz. We propose to use an array projector for 3-D shape measurements, which enables much higher projection frame rates of up to the 100-kHz range. In contrast to previous setups, it does not project well-known phase-shifted sinusoidal fringes and Gray code patterns, but aperiodic sinusoidal fringes. This new technique, based on sine-shaped fringes with spatially and temporally varying offset, amplitude, period length, and phase shift, allows accurate 3-D measurement of objects, even with sharp edges, high slope, or varying surface properties, at high speed up to the kilohertz range. This paper explains the 3-D measurement principle and the basic design of an array projector that projects aperiodic sinusoidal fringes. It verifies the consistency between specified and projected patterns and points out the results of the setup’s characterization, e.g., of its high-speed capability. Furthermore, first 3-D shape measurements at a projection frame rate of 3 kHz resulting in a 3-D frame rate of >330  Hz are presented and evaluated.

Array projection of aperiodic sinusoidal fringes for high-speed three-dimensional shape measurement

Die Erfindung betrifft eine Beleuchtungsvorrichtung fur Fahrzeuge mit einem langgestreckten Lichtleiter, der an einer Stirnseite eine Lichteinkoppelflache aufweist, wobei der Lichteinkoppelflache eine Lichtquelle zugeordnet ist, dass der Lichtleiter eine Mantelflache aufweist, an der das eingekoppelte Licht totalreflektiert wird zur Weiterleitung desselben in Langsrichtung des Lichtleiters und dass der Lichtleiter Auskoppelelemente aufweist, so dass das in dem Lichtleiter eingekoppelte Licht in Richtung einer vorderen Mantelflache umgelenkt und an derselben in Hauptabstrahlrichtung ausgekoppelt wird zur Erzeugung einer vorgegebenen Lichtfunktion, wobei auf einer zu der vorderen Mantelflache gegenuberliegenden Seite des langgestreckten Lichtleiters ein Zusatzlichtleiter angeordnet ist, der an einer Schmalseite eine Lichteinkoppelflache zur Einkopplung von einer Mehrzahl entlang derselben angeordneten Lichtquellen abgestrahlten Licht aufweist und der Auskoppelelemente aufweist, so dass das von den Lichtquellen abgestrahlte und in den Zusatzlichtleiter eingekoppelte Licht an einer dem Lichtleiter zugewandten Vorderseite in Richtung des Lichtleiters ausgekoppelt wird, und dass die dem Zusatzlichtleier zugeordneten Lichtquellen sequenziell ein- und/oder ausschaltbar sind zur Erzeugung einer in Langsrichtung des Lichtleiters ortlich veranderbaren Lichtabstrahlung.

Beleuchtungsvorrichtung für fahrzeuge

The natural compound eye has received much attention in recent years due to its remarkable properties, such as its large field of view (FOV), compact structure, and high sensitivity to moving objects. Many studies have been devoted to mimicking the imaging system of the natural compound eye. The paper gives a review of state-of-the-art artificial compound eye imaging systems. Firstly, we introduce the imaging principle of three types of natural compound eye. Then, we divide current artificial compound eye imaging systems into four categories according to the difference of structural composition. Readers can easily grasp methods to build an artificial compound eye imaging system from the perspective of structural composition. Moreover, we compare the imaging performance of state-of-the-art artificial compound eye imaging systems, which provides a reference for readers to design system parameters of an artificial compound eye imaging system. Next, we present the applications of the artificial compound eye imaging system including imaging with a large FOV, imaging with high resolution, object distance detection, medical imaging, egomotion estimation, and navigation. Finally, an outlook of the artificial compound eye imaging system is highlighted.

https://iopscience.iop.org/article/10.1088/1748-3190/aaffb5/pdf

Review of state-of-the-art artificial compound eye imaging systems.

For a given illumination source brightness, the transmitted flux of common single-aperture projection optics scales with all three system dimensions, thus preventing the realization of slim devices along with a high lumen output In this article we introduce a multichannel approach, called “array projector,” which breaks this constraint, thus enabling the realization of ultraslim but high flux systems with inherent homogenization for still image content The concept is based on regular two-dimensional arrangements of absorbing object structures and projective microlenses superposing their individual images on the screen After deriving first-order scaling laws for the multichannel projector in contrast to common single-aperture optics, specification of system parameters is shown considering aberrations of a single-channel and collective effects of the array The technological realization of a sample system is shown and characterized in terms of modulation transfer, homogeneity, depth of focus and flux

Ultraslim fixed pattern projectors with inherent homogenization of illumination

Die Erfindung betrifft ein Projektionsdisplay mit mindestens einer Lichtquelle (1) sowie regelmasig angeordneten optischen Kanalen. Die optischen Kanale enthalten mindestens eine Feldlinse (2), der jeweils eine abzubildende Objekt Struktur (3) sowie mindestens eine Projektionslinse (4) zugeordnet ist. Der Abstand der Projektionslinsen zu den zugeordneten Objektstrukturen entspricht der Brennweite der Projektionslinsen, wahrend der Abstand der abzubildenden Objektstrukturen zu der zugeordneten Feldlinse derart gewahlt wird, dass eine Kohlersche Beleuchtung der zugeordneten Projektionslinse ermoglicht wird. Es kommt dann zu einer Uberlagerung der einzelnen Projektionen zum Gesamtbild.

Projektionsdisplay und dessen Verwendung

A projection display comprising an imaging unit is described, said imaging unit being designed to generate individual images in a distribution, such as e.g. a two-dimensional distribution, of partial regions of an imaging plane of the imaging unit, and a multi-channel optical unit, which is configured to image per channel in each case an assigned individual image or an assigned partial region of the imaging unit, to be precise such that the imaging of the individual images in a projection surface is at least partly superimposed to form a total image, wherein the projection surface is a non-planar freeform surface, such as e.g. a curved surface, and/or is tilted relative to the imaging plane, and the imaging unit is designed in such a way that constellations of points in the partial images which are respectively superimposed by the multi-channel optical unit in a respective common point in the total image differ depending on the distance between the respective common point in the total image and the multi-channel optical unit. Alternatively, imaging unit and multi-channel optical unit are designed in such a way that a manifestation of a contribution of each channel to the total image varies locally across the total image depending on the distance between the respective common point in the total image and the multi-channel optical unit.

Projection display and method for displaying a total image for projection freeform surfaces or tilted projection surfaces

A projection display includes an imager for displaying sub-images in a two-dimensional distribution of sub-areas of the imager and a projection optics array with a two-dimensional distribution of projection optics. The projection optics array is configured to superimpose projections of the sub-images to an overall image in an image plane such that a mutual area overlap of the projections of the sub-images in the image plane in pairs results, which is between 0.1 and 0.8 for all pairs. Here, the projection display is implemented such that the overall image is a virtual overall image.

Projection display and method for projecting an overall image

The invention relates to a projection display having at least one light source (1), and optical channels arranged at regular intervals. The optical channels include at least one field lens (2) having one dedicated object structure (3) to be imaged and at least one projection lens (4). The distance between the projection lenses to the dedicated object structures equals the focal distance of the projection lenses, whereas the distance of the object structures to be imaged to the dedicated field lens is selected such that a Kohler illumination of the dedicated projection lens is possible. The individual projections are then superimposed to form an overall picture.

Marcel Sieler

Papers

Ultraslim fixed pattern projectors with inherent homogenization of illumination

Projektionsdisplay und dessen Verwendung

Projection display and method for displaying a total image for projection freeform surfaces or tilted projection surfaces

Projection display and method for projecting an overall image

Projection display and use thereof