US 11,708,958 B2
Illumination systems for reflective displays
Dirk Hertel, Quincy, MA (US); Richard J. Paolini, Jr., Framingham, MA (US); Benjamin Harris Paletsky, Morris, CT (US); and Stephen J. Telfer, Arlington, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Jul. 29, 2022, as Appl. No. 17/876,910.
Application 17/876,910 is a division of application No. 16/218,564, filed on Dec. 13, 2018, granted, now 11,460,165.
Application 16/218,564 is a continuation of application No. 13/867,633, filed on Apr. 22, 2013, granted, now 10,190,743.
Claims priority of provisional application 61/654,405, filed on Jun. 1, 2012.
Claims priority of provisional application 61/636,070, filed on Apr. 20, 2012.
Prior Publication US 2022/0364706 A1, Nov. 17, 2022
Int. Cl. G03B 21/14 (2006.01); G03B 21/10 (2006.01); G02F 1/167 (2019.01); G03B 21/608 (2014.01); G03B 21/62 (2014.01); G02F 1/1677 (2019.01); F21S 43/30 (2018.01); F21V 14/00 (2018.01); F21S 43/20 (2018.01); F21S 41/64 (2018.01)
CPC F21S 43/30 (2018.01) [F21S 43/26 (2018.01); F21V 14/003 (2013.01); G03B 21/10 (2013.01); G03B 21/14 (2013.01); F21S 41/645 (2018.01); G02F 1/167 (2013.01); G02F 1/1677 (2019.01); G03B 21/608 (2013.01); G03B 21/62 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A display device comprising a digital projector and a reflective surface mounted on a common frame, the digital projector comprising a light source, a projection lens and at least one additional optical element adapted to cause a projected image to be formed on the reflective surface, wherein the light passing from the light source through the projection lens is folded by more than 180 degrees in a plane containing the principal axis of the projection lens and a plane of symmetry of the at least one additional optical element before being reflected from the reflective surface,
wherein the reflective surface is an electrophoretic display, an electro-wetting display, an electrochromic display, a rotating bichromal display, or a reflective liquid crystal display, and
wherein pixels of an image from the digital projector are mapped 1:1 onto pixels of the reflective display.