US5317409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection television with LCD panel adaptation to reduce moire fringes
Assignee: Philips North America LLC
•
Filing: 1991-12-03
•
Granted: 1994-05-31
•
Expires: 2011-12-03
Abstract
Abstract A diagonally oriented LCD panel is used in a rear screen LCD projection television to reduce moire fringes on the display.
Inventors
- 👤 Stephen Macocs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:55
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/1335; G02F1/133526
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A rear screen LCD projection television comprising a lenticular screen having a plurality of lenticulars; an LCD panel including a plurality of addressable pixels, which pixels are addressed according to a plurality of scan lines; and an optical path connecting the LCD panel to the lenticular screen, the path being such that the scan lines, when incident on the lenticular screen, are perpendicular to the lenticulars; characterised in that the pixels of the LCD panel are shaped so that no interpixel region produces a light pattern which, when incident on the lenticular screen, is parallel to the lenticulars, whereby moire fringes on the lenticular screen are reduced.
Claim 2
Dependent Claim
107 words
A rear screen LCD projection television comprising a lenticular screen having a plurality of lenticulars; an LCD panel including a plurality of addressable pixels, which pixels are addressed according to a plurality of scan lines; and an optical path connecting the LCD panel to the lenticular screen, the path being such that the scan lines, when incident on the lenticular screen, are perpendicular to the lenticulars; characterised in that the pixels of the LCD panel are shaped so that no interpixel region produces a light pattern which, when incident on the lenticular screen, is parallel to the lenticulars, whereby moire fringes on the lenticular screen are reduced.
Claim 3
Dependent Claim
47 words
The television of claim 1 comprising a lamp for radiating light onto the LCD panel, which is disposed to selectively interrupt light from the lamp according to received television signals; and a projection lens, disposed to focus light received from the LCD panel onto the lenticular screen.
Claim 4
Dependent Claim
25 words
The television of claim 1 wherein the lenticulars are vertical and separated by black stripes for contrast; and the LCD panel comprises diagonal interpixel regions.
Claim 5
Dependent Claim
22 words
The television of claim 3 wherein the LCD pixels are diamond shaped and the interpixel regions are at 45° from the vertical.
Claim 6
Dependent Claim
17 words
The television of claim 1 comprising three LCD panels, a respective one for each of three colors.
Claim 7
Dependent Claim
19 words
The television of claim 5 wherein the lenticulars are vertical and each LCD panel comprises respective diagonal interpixel regions.
Claim 8
Dependent Claim
22 words
The television of claim 6 wherein the LCD pixels are diamond shaped and the interpixel regions are at 45° from the vertical.
Claim 9
Dependent Claim
47 words
The television of claim 5 comprising a lamp; a splitter for splitting light from the lamp into three separate beams incident on the three LCD panels; means for combining light from the three LCD panels; and the lenticular screen displaying light combined by the means for combining.
References Cited (Backward Citations)
US3938134A
Cited
US4373784A
Cited
US4778257A
Cited
GB2102175A
Cited
US4531812A
Cited
JPS59135427A
Cited
US4544946A
Cited
JPS61254928A
Cited
JPS61282823A
Cited
JPS62237428A
Cited
NL8601063A
Cited
US4908609A
Cited
JPS63142330A
Cited
JPS63271203A
Cited
EP0302653A2
Cited
JPS6479728A
Cited
US4811003A
Cited
JPH02123342A
Cited
US5071224A
Cited
JPH02158725A
Cited
JPH02212880A
Cited
US5146342A
Cited
US5115305A
Cited
US5146356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |