公开(公告)号：DE19947470A1

公开(公告)日：2000-04-27

申请号：DE19947470

申请日：1999-10-02

Applicant: IBM

Inventor： DOANY FUAD ELIAS ,  DOVE DEREK BRIAN

IPC: G09F9/00 ,  G02B5/04 ,  G02B27/10 ,  G02B27/14 ,  G03B21/00 ,  H04N9/31 ,  G02B27/18

Abstract: An optical projection display system, such as a liquid crystal display device, is disclosed. A feature of the present invention is that the projection display system utilizes a modified X-cube (or X-prism) arrangement wherein the internal angles of the prisms forming the modified X-cube deviate from 90 DEG . The utilization of the present modified X-cube arrangement improves contrast for checkerboard images, minimizes the possibility of spurious unwanted reflections from entering the projection lens as well as substantially eliminating glare and ghost images typically present using prior art X-cubes.

公开(公告)号：DE69003022T2

公开(公告)日：1994-04-14

申请号：DE69003022

申请日：1990-06-21

Applicant: IBM

Inventor： BOLAND JOHN JAMES ,  DOVE DEREK BRIAN ,  TAKAMORI TAKESHI

IPC: H02N15/04 ,  F16C39/06 ,  H02N15/00 ,  H03K17/92 ,  H01F7/22

公开(公告)号：DE69003022D1

公开(公告)日：1993-10-07

申请号：DE69003022

申请日：1990-06-21

Applicant: IBM

Inventor： BOLAND JOHN JAMES ,  DOVE DEREK BRIAN ,  TAKAMORI TAKESHI

IPC: H02N15/04 ,  F16C39/06 ,  H02N15/00 ,  H03K17/92 ,  H01F7/22