Patent ID: 7009773

Claim:
A compact optical assembly useful for head mounted projection display (HMPD) or head-mounted displays (HMDs) comprising: (a) a first baffled microlenslet array and a second cooperating microlenslet array which provide an optical means for magnifying images written on a microdisplay within the HMPD or the HMD before imaging to the users' eye (b) miniature projection optics for further magnifying the images in HMPD or an eyepiece optics for further magnifying the images in HMD; and (c) retro-reflective means for receiving said magnified images by disposing them on a micro-structures retro-reflective screen integrated on the interior surface of said HMPD or said HMD and within the field of view of said miniature projection optics or said eyepiece optics; and wherein both of said miniature projection optics or said eyepiece optics and said retro-reflective means are located internally of the external housing of said HMPD or HMD assembly, respectively.