A REFLECTIVE DISPLAY UTILIZING FRESNEL MICRO-REFLECTORS

A REFLECTIVE DISPLAY UTILIZING FRESNEL MICRO-REFLECTORS

A display (22) adapted for use in head mounted display systems (20). The display (22) includes an array of reflecting pixels (32, 39, 231, 239), a first light source (35, 255) for illuminating the array of reflecting pixels (32, 39, 231, 239), and a mask screen (33) located between the light source...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: MERTZ, PIERRE, H
Format: Patent
Sprache:eng ; fre
Schlagworte:
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Zusammenfassung:A display (22) adapted for use in head mounted display systems (20). The display (22) includes an array of reflecting pixels (32, 39, 231, 239), a first light source (35, 255) for illuminating the array of reflecting pixels (32, 39, 231, 239), and a mask screen (33) located between the light source (35, 255) and the array of reflecting pixels (32, 39, 231, 239). The mask screen (33) includes a plurality of mask elements, one mask element corresponding to each of the pixels. The mask elements have a first state in which the mask element is transparent and a second state in which the mask element is opaque. The state of the mask element is determined by a potential generated by the corresponding pixel (31, 39, 231, 239). Each of the pixels includes a reflector (38, 47, 238, 247) for reflecting light from the first light source (35, 255) into a cone having an opening angle (41, 44) and an axis (42, 43) which depends on the position of the pixel (31, 39, 231, 239) in the display (22) and on the telecentricity of the imaging optic (27). In the preferred embodiment of the present invention, each of the reflectors is an off-axis portion of a diffractive micro Fresnel mirror (100). A color display (22) is implemented by including additional light sources (254, 256) having wavelengths different from the first light source (35, 255). The additional light sources (254, 256) are spatially displaced from the first light source (35, 255) and each other to provide proper color mixing. L'invention concerne un écran (22) conçu pour être utilisé dans des systèmes d'affichage (20) de visiocasque. L'écran (22) comprend un ensemble de pixels de réflexion (32, 39, 231, 239), une première source lumineuse (35, 255) destinée à éclairer l'ensemble de pixels de réflexion (32, 39, 231, 239) et un écran masque (33) situé entre la source lumineuse (35, 255) et l'ensemble de pixels de réflexion (32, 39, 231, 239). L'écran masque (33) comprend une pluralité d'éléments de masque, un élément de masque correspondant à chacun des pixels. Les éléments de masque présentent un premier état dans lequel l'élément de masque est transparent et un deuxième état dans lequel l'élément de masque est opaque. L'état de l'élément de masque est déterminé par un potentiel produit par le pixel correspondant (31, 39, 231, 239). Chacun des pixels comprend un réflecteur (38, 47, 238, 247) permettant de réfléchir la lumière de la première source lumineuse (35, 255) dans un cône possédant un angle d'ouverture (4