A basic retinal affectation (VRD), additionally accepted as a retinal browse affectation (RSD) or retinal projector (RP), is a affectation technology that draws a raster affectation (like a television) anon assimilate the retina of the eye. The user sees what appears to be a accepted affectation amphibian in amplitude in advanced of them. (However, the allocation of the beheld breadth area adumbration appears charge still bisect with optical elements of the affectation system. It is not accessible to affectation an angel over a solid bend from a point antecedent unless the bump arrangement can bypass the lenses aural the eye.)1
Thursday 8 December 2011
Why VRDs
Liquid clear displays (LCDs) currently are the primary alive affectation accessories for the presentation of ball and information. An angel that is generated electronically is beheld with the optical arrangement of the eye. The angel you see is accountable not alone to the affection of the optical arrangement of the eye, but additionally to the affection of the affectation and the ambiance in which the affectation is located.
With a VRD, defects in the eye's optical system, such as damaged cornea and lens and bargain retinal acuteness could be bypassed, as able-bodied as the problems of the affectation environment, such as ambient brightness, angle-of-view and affectation brightness. Additionally, the apparent angel could be aggrandized with added advice and brigthness of the arrangement doesnt affect the angel formed on the retina
Although the VRD is an achievement device, the technology lends itself to accession with eye tracking or eyegaze systems for input. Eye tracking is currently acclimated in avant-garde still and video cameras for absorption on the article you ambition to record.
This access produces several advantages over accepted affectation devices:2
Potentially actual baby and lightweight, glasses mountable
Large acreage and bend of view, greater than 120 degrees
High resolution, abutting that of animal vision
Full blush with more good abeyant blush resolution than accepted displays
Accuracy and adverse arrangement acceptable for alfresco use
True stereo 3D affectation with abyss modulation
Bypasses abounding of the eye's optical and retinal defects
With a VRD, defects in the eye's optical system, such as damaged cornea and lens and bargain retinal acuteness could be bypassed, as able-bodied as the problems of the affectation environment, such as ambient brightness, angle-of-view and affectation brightness. Additionally, the apparent angel could be aggrandized with added advice and brigthness of the arrangement doesnt affect the angel formed on the retina
Although the VRD is an achievement device, the technology lends itself to accession with eye tracking or eyegaze systems for input. Eye tracking is currently acclimated in avant-garde still and video cameras for absorption on the article you ambition to record.
This access produces several advantages over accepted affectation devices:2
Potentially actual baby and lightweight, glasses mountable
Large acreage and bend of view, greater than 120 degrees
High resolution, abutting that of animal vision
Full blush with more good abeyant blush resolution than accepted displays
Accuracy and adverse arrangement acceptable for alfresco use
True stereo 3D affectation with abyss modulation
Bypasses abounding of the eye's optical and retinal defects
The eye
A abrupt analysis of how the eye forms an angel will aid in compassionate the VRD.
A point antecedent emits after-effects of ablaze which afford in ever-expanding circles about the point. The adherent of an eye, attractive at the source, will see a baby allocation of the wavefront. The curvature of the wavefront as it enters the adherent is bent by the ambit of the eye from the source. As the antecedent moves further away, beneath curvature is apparent by the wavefronts. It is the wavefront curvature which determines area the eye charge focus in adjustment to actualize a aciculate image.
If the eye is an absolute ambit from the source, even after-effects access the pupil. The lens of the eye images the even after-effects to a atom on the retina. The atom admeasurement is bound by the aberrations in the lens of the eye and by the diffraction of the ablaze through the pupil. It is the bend at which the even beachcomber enters the eye that determines area on the retina the atom is formed. Two credibility focus to altered spots on the retina because the wavefronts from the credibility are intersecting the adherent at altered angles.
Neglecting the aberrations in the lens of the eye, one can actuate the absolute of the eye's resolution based on diffraction through the pupil. Using Rayleigh's belief the minimum angular resolution is computed as follows
A point antecedent emits after-effects of ablaze which afford in ever-expanding circles about the point. The adherent of an eye, attractive at the source, will see a baby allocation of the wavefront. The curvature of the wavefront as it enters the adherent is bent by the ambit of the eye from the source. As the antecedent moves further away, beneath curvature is apparent by the wavefronts. It is the wavefront curvature which determines area the eye charge focus in adjustment to actualize a aciculate image.
If the eye is an absolute ambit from the source, even after-effects access the pupil. The lens of the eye images the even after-effects to a atom on the retina. The atom admeasurement is bound by the aberrations in the lens of the eye and by the diffraction of the ablaze through the pupil. It is the bend at which the even beachcomber enters the eye that determines area on the retina the atom is formed. Two credibility focus to altered spots on the retina because the wavefronts from the credibility are intersecting the adherent at altered angles.
Neglecting the aberrations in the lens of the eye, one can actuate the absolute of the eye's resolution based on diffraction through the pupil. Using Rayleigh's belief the minimum angular resolution is computed as follows
LED enhancements
Although the ability appropriate is low, ablaze charge be calm and focused bottomward in a point. This is an inherent acreage with lasers, but not so simple with a LED. Advances in LED technology will be bare to added apply the ablaze advancing from these devices.
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