Scanned beam display with adjustable accommodation

G - Physics – 02 – B

Patent

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Details

G02B 27/02 (2006.01) G01J 1/20 (2006.01) G02B 23/00 (2006.01) G02B 27/01 (2006.01) G09G 3/00 (2006.01) G09G 5/00 (2006.01)

Patent

CA 2347198

A scanning beam display 10/50/150 controls the curvature of scanning light wave impinging on the eye to simulate image points of differing depth. To simulate an object at a far distance the generated light waves are flatter. To simulate closer objects, the light wave curvature increases. When changing the curvature of the light waves, the eye responds by altering its focus. The curvature of the light waves thus determines the apparent focal distance from the eye to the virtual object. To vary the curvature, either a variable focus lens 22/320 or a variable index of refraction device 22/330/350 is used. Alternatively, a moving point source is used. The generated apparent distance of a virtual object is correlated to a detected distance in a background field of view. Intensity of the virtual object is correlated to detected intensity of background light.

Afficheur à balayage de faisceau (10, 50, 150) qui commande la courbure d'une onde lumineuse de balayage aboutissant sur l'oeil de façon à simuler des points d'image de différente profondeur. Pour simuler un objet éloigné, les ondes lumineuses générées sont plus plates. Pour simuler des objets plus proches, la courbure des ondes lumineuses augmente. Quand on modifie la courbure des ondes lumineuses, l'oeil répond par un changement d'accommodation. La courbure des ondes lumineuses détermine donc la distance focale apparente entre l'oeil et l'objet virtuel. Pour faire varier la courbure, on utilise soit un objectif à focale variable (22, 320), soit un dispositif à indice de réfraction variable (22, 330, 350). On peut également utiliser une source ponctuelle mobile. La distance apparente générée de l'objet virtuel est corrélée à la distance détectée dans un champ de vision de fond. L'intensité de l'objet virtuel est corrélée à l'intensité détectée pour la lumière de fond.

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