Alan W Rosenbluth

US Patent:

6341038, Jan 22, 2002

Filed:

Feb 22, 2000

Appl. No.:

09/507996

Inventors:

Russell Alan Budd - North Salem NY
Derek Brian Dove - Mt. Kisco NY
Alan Edward Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 530

US Classification:

359487, 359495, 362 19

Abstract:

An apparatus for polarization conversion having a light source for supplying vertically and horizontally linearly polarized light to an optical path and a parabolic mirror disposed in the optical path and proximate to the light source. In different embodiments, the parabolic mirror has a mirror coating to induce a phase shift of 0Â, 90Â, or an arbitrary phase shift between incident light and reflected light. A polarizer means, preferably a reflective polarizer film, is disposed in the optical path for reflecting light of one of the linear polarizations and for transmitting the other linear polarization. Lastly, one or more waveplates are disposed in the optical path between the polarizer means and the parabolic mirror. The waveplates have opposing segments each having axes which are antiparallel to each other for recycling the reflected linear polarization by converting it to the transmitted polarization.

US Patent:

6377233, Apr 23, 2002

Filed:

Jul 30, 2001

Appl. No.:

09/918249

Inventors:

Evan G. Colgan - Chestnut Ridge NY
Laura L. Kosbar - Mohegan Lake NY
Alan E. Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G09G 334

US Classification:

345 84, 345 85, 345 90, 345 92, 345 93, 345 97, 345 98, 359222, 359223, 359224, 359291, 359293, 359295, 359298, 359900

Abstract:

A display device, in accordance with the present invention includes a transparent substrate and an array of pixels formed on the substrate, each pixel comprises a transparent electrode and a deformable member electrically actuated between a first state and a second state, wherein in the first state a liquid including a dye is disposed in a gap between the transparent electrode and the deformable member and wherein in the second state the deformable member reduces the gap between the transparent electrode and the deformable member such that the liquid is substantially removed between the deformable layer and the transparent electrode in the area of contact. A plurality of switches are formed on the substrate for supplying control signals to the array of pixels to selectively actuate the deformable members of the pixels, wherein each switch comprises an actuating member movable between an active state and an inactive state, whereby in the active state any control signal supplied to the switch passes through the switch, and in the inactive state any control signal supplied to the switch is prevented from passing through the switch. Fabrication methods are also disclosed.

US Patent:

6512502, Jan 28, 2003

Filed:

May 27, 1998

Appl. No.:

09/085065

Inventors:

Kenneth C. Ho - Yonkers NY
Alan Edward Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G09G 334

US Classification:

345 84, 348750

Abstract:

A projection display for displaying a color image formed of a plurality of color pixels. Each color pixel has a combination of different color light components. The display has a light source for supplying light to an optical path. A projection lens is disposed in the optical path, as are first and second light valves. The first and second light valves each have a plurality of subpixels. Each subpixel has an associated color filter for reflecting a corresponding color light component. The sub-pixels are grouped into groups of three, each group has a single sub-pixel from one of the first or second light valves and the remaining two sub-pixels from the other light valve, which together combine to form a color pixel of the color image for each of the color pixels of the color image. Lastly, directing means are provided for directing the light from the light source to the first and second light valves and for directing the respective color light components reflected from the light valves towards the projection lens which projects and magnifies the color pixels onto a screen thereby forming the color image.

US Patent:

6563566, May 13, 2003

Filed:

Jan 29, 2001

Appl. No.:

09/771793

Inventors:

Alan E. Rosenbluth - Yorktown Heights NY
Scott Josef Bukofsky - Hopewell Junction NY
Alfred K. K. Wong - Pokfulam, HK

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G03B 2754

US Classification:

355 67, 355 55, 355 77, 430311, 430312, 430323, 2504922, 25049222

Abstract:

A system and method is described for lithographically printing patterns on a semiconductor using combinations of illumination and mask patterns which are optimized together to produce the desired pattern. The method of optimizing both illumination and mask pattern allows the development of mask patterns that are not constrained by the geometry of the desired pattern to be printed. Thus, the method provides high quality images even when the desired printed patterns have critical dimensions that approach the resolution limits of a lithographic system. The resulting mask patterns using the method do not obviously correspond to the desired patterns to be printed. Such masks may include phase-shifting technology that use destructive interference to define dark areas of the image and are not constrained to conform to the desired printed pattern.

US Patent:

6636276, Oct 21, 2003

Filed:

Sep 9, 1999

Appl. No.:

09/392957

Inventors:

Alan Edward Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02F 11335

US Classification:

349 8, 349 5, 349 9, 353 33, 353 34

Abstract:

A projection display system includes a light source, wavelength-selective retarder device, first and second reflective light valves (LVs), a polarizing beam splitter (PBS), and a wavelength-selective filtering device. The wavelength-selective retarder device receives a uniformly polarized light from the light source and produces a first dark-state light having a first polarization state at a first set of wavelengths and a second dark-state light having a second polarization state at a second set of wavelengths. The first LV receives the first dark-state light and produces a first bright-state light by rotating the polarization from the first polarization state to the second polarization state. The second LV receives the second dark-state light and produces a second bright-state light by rotating the polarization from the second polarization state to the first polarization state. The PBS, positioned between the wavelength-selective retarder device and the first and second LVs, directs the first and second dark-state lights to the first and second LVs respectively, and also directs the first and second bright-state lights to a screen.

US Patent:

6650383, Nov 18, 2003

Filed:

May 25, 2000

Appl. No.:

09/578272

Inventors:

Minhua Lu - Mohegan Lake NY
Alan Edward Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02F 11347

US Classification:

349 75

Abstract:

A reflective liquid crystal lightvalve for modulating the polarization of incident light within a specified band of wavelengths into on and off states, comprises: (i) a pixelated reflective backplane; (ii) a first liquid crystal layer, positioned proximate the pixelated reflective backplane, the first liquid crystal layer being tuned in the off state to switch incident light at the center of the specified band of wavelengths into a state that is not fully off; and (iii) a second liquid crystal layer, positioned proximate the first liquid crystal layer wherein the first liquid crystal layer is positioned between the second liquid crystal layer and the pixelated reflective backplane, the second liquid crystal layer having a birefringence which, at a given depth within its thickness, is substantially equal and opposite to a birefringence of a layer within the first liquid crystal layer that is located at a matching distance from a midplane separating the first and second liquid crystal layers.

US Patent:

6665033, Dec 16, 2003

Filed:

Nov 30, 2000

Appl. No.:

09/726951

Inventors:

Alessandro C. Callegari - Yorktown Heights NY
Praveen Chaudhari - Briarcliff Manor NY
Fuad E. Doany - Katonah NY
James P. Doyle - Bronx NY
Eileen A. Galligan - Fishkill NY
James H. Glownia - Somers NY
Gareth G. Hougham - Ossining NY
James A. Lacey - Mahopac NY
Shui-Chih Lien - Briarcliff Manor NY
Minhua Lu - Mohegan Lake NY
Alan E. Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02F 11337

US Classification:

349123, 349 31, 349124, 349125, 20415715

Abstract:

A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.

US Patent:

6798475, Sep 28, 2004

Filed:

Mar 2, 1999

Appl. No.:

09/260869

Inventors:

Kenneth C. Ho - Yonkers NY
Minhua Lu - Mohegan Lake NY
Alan E. Rosenbluth - Yorktown Heights NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02F 11335

US Classification:

349113, 349 76, 349146

Abstract:

A liquid crystal (LC) lightvalve comprising a twisted nematic LC layer whose molecules are aligned with pixel edges at the mirror backplane, thereby providing improved contrast and efficiency, and reduced visibility of post spacers in black state. The present invention is directed to an LC structure wherein the backplane is rubbed in a direction rectilinear with pixel edges. The LC layer is given the same twist rotation and birefringence as in the conventional TN lightvalve. Polarization control is maintained by illuminating the lightvalve with light whose polarization is rotated by the twist angle relative to the x,y, pixel axes, and by collecting the orthogonally polarized component of the reflected light. The lightvalve top glass is thus rubbed in a direction which is rotated by the twist angle from the horizontal or vertical direction at which the backplane is rubbed.