US5278545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backlit LCD display panels including sensible panels for pen-driven computers
Assignee: Showa Hastumei Kaisha Ltd
•
Filing: 1992-06-11
•
Granted: 1994-01-11
•
Expires: 2012-06-11
Abstract
Abstract A combined backlighting panel, position determination system, and display for use in pen-driven computer systems. There is a panel of a transparent material divided into a plurality of illumination areas. Each of the illumination areas comprises a lensing structure on the bottom surface of the panel for directing entering light towards the top surface of the panel over the associated illumination area. A plurality of light-emitting diodes are disposed to direct light into the lensing structure of respective ones of the plurality of illumination areas. A substrate carries the grids of a digitizer tablet as well as the light emitting diodes. The panel is disposed on the substrate with the bottom surface adjacent the substrate. A display panel is disposed over the top surface of the panel.
Inventors
- 👤 Donald A. Streck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:59
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G02; G02B; G02B6/00; G02B6/0001; G02B6/0005; G02B6/0008; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/0038; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/13338; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133603; G02F1/133606
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A combined backlighting panel and position determination system for pen-driven computer displays comprising: a) a diffusing panel of a transparent material, said panel being divided into a plurality of illumination areas, each of said illumination areas comprising lensing structure means on a bottom surface of said diffusing panel for directing light entering said lensing structure means into said diffusing panel towards a top surface of said diffusing panel and across an associated illumination area; b) a plurality of light-emitting diodes disposed to direct light into said lensing structure means of respective ones of said plurality of illumination areas; c) a substrate carrying said plurality of light emitting diodes; and, d) a portion of detection means for determining a position of a cursor adjacent said substrate comprising grid conductors of a digitizing tablet also carried by said substrate; wherein, e) said diffusing panel is disposed on said substrate with said bottom surface adjacent said substrate.
Claim 2
Dependent Claim
154 words
A combined backlighting panel and position determination system for pen-driven computer displays comprising: a) a diffusing panel of a transparent material, said panel being divided into a plurality of illumination areas, each of said illumination areas comprising lensing structure means on a bottom surface of said diffusing panel for directing light entering said lensing structure means into said diffusing panel towards a top surface of said diffusing panel and across an associated illumination area; b) a plurality of light-emitting diodes disposed to direct light into said lensing structure means of respective ones of said plurality of illumination areas; c) a substrate carrying said plurality of light emitting diodes; and, d) a portion of detection means for determining a position of a cursor adjacent said substrate comprising grid conductors of a digitizing tablet also carried by said substrate; wherein, e) said diffusing panel is disposed on said substrate with said bottom surface adjacent said substrate.
Claim 3
Dependent Claim
168 words
A combined backlighting panel, position determination system, and display for pen-driven computers comprising: a) a diffusing panel of a transparent material, said diffusing panel being divided into a plurality of illumination areas, each of said illumination areas comprising lensing structure means on a bottom surface of said diffusing panel for directing light entering said lensing structure means into said diffusing panel towards a top surface of said diffusing panel and across an associated illumination area; b) a plurality of light-emitting diodes disposed to direct light into said lensing structure means of respective ones of said plurality of illumination areas; c) a substrate carrying said plurality of light emitting diodes; d) a display panel disposed over said top surface of said diffusing panel; and, e) a portion of detection means for determining a position of a cursor adjacent said substrate comprising grid conductors of a digitizing tablet also carried by said substrate; wherein, f) said diffusing panel is disposed on said substrate with said bottom surface adjacent said substrate.
Claim 4
Dependent Claim
168 words
A combined backlighting panel, position determination system, and display for pen-driven computers comprising: a) a diffusing panel of a transparent material, said diffusing panel being divided into a plurality of illumination areas, each of said illumination areas comprising lensing structure means on a bottom surface of said diffusing panel for directing light entering said lensing structure means into said diffusing panel towards a top surface of said diffusing panel and across an associated illumination area; b) a plurality of light-emitting diodes disposed to direct light into said lensing structure means of respective ones of said plurality of illumination areas; c) a substrate carrying said plurality of light emitting diodes; d) a display panel disposed over said top surface of said diffusing panel; and, e) a portion of detection means for determining a position of a cursor adjacent said substrate comprising grid conductors of a digitizing tablet also carried by said substrate; wherein, f) said diffusing panel is disposed on said substrate with said bottom surface adjacent said substrate.
References Cited (Backward Citations)
US4263594A
Cited
US4330813A
Cited
US5008658A
Cited
US5153386A
Cited
US5016956A
Cited
US5075789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |