The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 2009
Filed:
Jan. 20, 2006
Kevin Gerard Donahue, Harvard, MA (US);
Kevin Gerard Donahue, Harvard, MA (US);
Other;
Abstract
A display system combines the principles of total internal reflection and halftone reflection. The display system includes a light guide, a light-reflecting see-through image disposed on the surface of the light guide, and a light-blocking see-through layer disposed over the image. A person viewing the light-blocking layer at a certain distance can see through the light guide without seeing the image. The display system can include a pair of eyeglasses that can provide self-illumination for night reading or serve as a hands-free flashlight. Also, novelty glasses can emit different colored lights as well as colored, lighted images. The display system can also include one-way see-through windows that emit lighted text and images for signage and advertising.