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1. IN201717027602 - DISPLAY DEVICE WITH TOTAL INTERNAL REFLECTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
1. A display device comprising:a display, operable to generate a real image; andan optical system, comprising one or more lenslets, arranged to generate a virtualsub-image from a respective partial real image on the display, by each lenslet projectinglight from the display to an eye position;wherein the sub-images combine to form a virtual image viewable from the eyeposition;wherein at least one of the lenslets is such that the light rays from the display tothe eye position are deflected sequentially at least four times by a refraction (R), areflection (X), a total internal or metallic reflection (I), and a refraction (R) in that order(RXIR lenslet). 2. The display device of claim 1, further comprising a display driver operative toreceive an input image, and to generate the respective partial real images such that theresulting virtual sub-images align to form a virtual image of said input image as saidviewable virtual image. 3. The display device of claim 1, wherein the first refraction (R) and the totalinternal or metallic reflection (I) are performed by the same surface with non-coincidentoverlapping clear apertures. 4. The display device of claim 1, wherein the one or more lenslets comprise at leasttwo said RXIR lenslets. 5. The display device of claim 1, wherein the one or more lenslets comprise at leastone said RXIR lenslet and at least one lenslet that is a non-RXIR lenslet. 6. The display device of claim 5, wherein the at least one RXIR lenslet generates itsvirtual sub-image at a central portion of the viewable virtual image, and the at least onenon-RXIR lenslet generates its virtual sub-image at a portion of the virtual image nearerto a periphery of the viewable virtual image. 7. The display device of claim 1, wherein at least two lenslets are non-superposable. 8. The display device of claim 1, arranged to produce partial virtual imagescomprising a foveal part projected by an eye onto a 1.5 mm fovea of an eye when saideye is at the position of an imaginary sphere at said eye position with its pupil within thepupil range, said foveal part having a higher resolution than a peripheral part of theviewable virtual image. 9. The display device of claim 1, wherein the optics is placed at a distance from aneye sphere at the eye position between 5 and 40 mm, the at least one lenslet forming anarray subtending a solid angle from a closest point of the eye sphere comprising a conewith 40 degrees whole angle, wherein the display is on a side of the optics remote fromthe eye sphere, at a distance from the optics of no more than 80 mm. 10. The display device of claim 1, wherein the respective partial real images on thedisplay comprise at least two partial real images that overlap on a same portion of thedisplay and that are activated during different time periods, and wherein different lensletsimage said same portion of the display to different sub-images at different positions ofthe virtual image. 11. The display device of claim 1, further comprising a stray-light control system thatremoves light not contributing to the virtual sub-images. 12. The display device of claim 11, wherein the stray-light control system compriseslight-absorbent material in a part of the display device not crossed by light rayscontributing to the virtual sub-images. 13. The display device of claim 1 , wherein the stray-light control system comprises apolarizer and a half-wave rotator arranged to absorb light reflected back towards thedisplay. 14. The display device of claim 1, further comprising an eye tracking system using acamera. 15. A headgear comprising the display device of claim 1, with a mount for positioningthe display device on a human head with the eye position of the display device coincidingwith an eye of the human. 16. The headgear of claim 15, further comprising a second display device accordingclaim 1, mounted with the eye position of the second display device coinciding with asecond eye of the human.