Patent EP0365778A2 successfully refreshed from Google Patents.
EP0365778A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multicolor liquid crystal display
Assignee: International Business Machines Corp
•
Filing: 1989-08-18
•
Granted: —
•
Expires: 2009-08-18
Abstract
Abstract A liquid crystal display device is described which includes two transparent sheets separated by a given distance, with liquid crystal material being disposed therebetween. Adjacent one transparent sheet is a stack of at least three pleochroic polarizers (20) which act to separately polarize each incoming primary color wavelength. A second stack of at least three pleochroic polarizers (22) are adjacent the second transparent sheet and are oriented to select the primary color polarizations exiting from the liquid crystal structure.
Inventors
- 👤 Steven W. Depp
- 👤 Hiap L. Ong
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/133533; G02F1/133531; G02F1/137; G02F1/13725; G02F1/139; G02F1/1393; G02F1/1396; G02F1/1397
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A liquid crystal display device comprising: a cell having two transparent sheets separated by a predetermined distance; TN liquid crystal means disposed between said transparent sheets, said TN liquid crystal means acting to rotate the polarization vector of different light colors by different amounts for a given distance of travel by a light color through said TN liquid crystal means; at least three color-specific polarizer plates (20) in sandwich relationship with one said transparent sheet, each said polarizer plate oriented to provide light of a specific color with a known entry polarization, so that said TN liquid crystal means causes the polarization vector of each said light color to rotate by a known amount over said predetermined distance; and output polarizer means (22) adjacent said second transparent sheet.
Claim 2
Dependent Claim
128 words
A liquid crystal display device comprising: a cell having two transparent sheets separated by a predetermined distance; TN liquid crystal means disposed between said transparent sheets, said TN liquid crystal means acting to rotate the polarization vector of different light colors by different amounts for a given distance of travel by a light color through said TN liquid crystal means; at least three color-specific polarizer plates (20) in sandwich relationship with one said transparent sheet, each said polarizer plate oriented to provide light of a specific color with a known entry polarization, so that said TN liquid crystal means causes the polarization vector of each said light color to rotate by a known amount over said predetermined distance; and output polarizer means (22) adjacent said second transparent sheet.
Claim 3
Dependent Claim
20 words
The invention as defined in claim 1 wherein said output polarizer means (22) comprises three color specific polarizer plates (22).
Claim 4
Dependent Claim
22 words
The invention as defined in claim 1 or 2 further comprising: color filter means associated with at least one said transparent sheet.
Claim 5
Dependent Claim
21 words
The invention as defined in Claim 3 wherein said color filter means comprises a plurality of red, blue, green filter areas.
Claim 6
Dependent Claim
46 words
The invention as defined in one or more of the preceding claims 1 to 4 further comprising means for applying across said TN liquid crystal means, a voltage which causes said TN liquid crystal means to orient along the field lines created by said applied voltage.
Claim 7
Dependent Claim
43 words
A liquid crystal cell of planar form and constant thickness comprising: red, blue and green superimposed polarizing plates (20) adjacent one side (24) of said cell; and red, blue and green superimposed polarizing plates (22) adjacent the other side (26) of said cell.
Claim 8
Dependent Claim
43 words
A liquid crystal cell of planar form and constant thickness comprising: red, blue and green superimposed polarizing plates (20) adjacent one side (24) of said cell; and red, blue and green superimposed polarizing plates (22) adjacent the other side (26) of said cell.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.