公开(公告)号：DE69425610T2

公开(公告)日：2001-04-26

申请号：DE69425610

申请日：1994-06-08

Applicant: IBM

Inventor： GOODMAN DOUGLAS SEYMORE ,  HODGSON RODNEY TREVOR ,  LIPSCOMB JAMES SARGENT ,  LOY MICHAEL MING-TAK ,  WOLFE JR

IPC: F21V8/00 ,  G02B27/22 ,  G02F1/1335 ,  G02F1/13357 ,  G06F1/16 ,  G09F9/00 ,  H04N13/00 ,  H04N13/04

Abstract: A display assembly includes a display screen having a predetermined generally planar area for displaying transmissive data. A light source is provided for generating light of predetermined intensity, and a circular Fresnel lens is disposed between the light source and the display means, the circular Fresnel lens imaging the light source through the display means and onto an opposite side of the display means. A diffuser is disposed between the light source and the display means for diffusing the light. The intensity of the light source is selected to be appropriate for direct human viewing of the transmissive data.

公开(公告)号：DE3580199D1

公开(公告)日：1990-11-29

申请号：DE3580199

申请日：1985-04-19

Applicant: IBM

Inventor： GOODMAN DOUGLAS SEYMORE

IPC: G01B11/00 ,  G02B5/28 ,  G06K7/10 ,  G06T1/00 ,  H04N1/028

Abstract: The physical separation between a rear illuminated opaque pattern (12) on a translucent substrate (24) and an optical pattern sensing device (22) viewing the shadow image of the opaque pattern is increased without any corresponding loss of resolution (and/or resolution may be increased without any corresponding reduction in the physical separation between the optical pattern sensing device and the opaque pattern) by positioning a norrow spectral band pass interference filter (30) between the opaque pattern and the optical pattern sensing device, and using as the rear illumination, light having a spectrally narrow band which substantially matches the pass band of the interference filter.

公开(公告)号：DE69425610D1

公开(公告)日：2000-09-28

申请号：DE69425610

申请日：1994-06-08

Applicant: IBM

Inventor： GOODMAN DOUGLAS SEYMORE ,  HODGSON RODNEY TREVOR ,  LIPSCOMB JAMES SARGENT ,  LOY MICHAEL MING-TAK ,  WOLFE JR

IPC: F21V8/00 ,  G02B27/22 ,  G02F1/1335 ,  G02F1/13357 ,  G06F1/16 ,  G09F9/00 ,  H04N13/00 ,  H04N13/04

Abstract: A display assembly includes a display screen having a predetermined generally planar area for displaying transmissive data. A light source is provided for generating light of predetermined intensity, and a circular Fresnel lens is disposed between the light source and the display means, the circular Fresnel lens imaging the light source through the display means and onto an opposite side of the display means. A diffuser is disposed between the light source and the display means for diffusing the light. The intensity of the light source is selected to be appropriate for direct human viewing of the transmissive data.