Gang Xu

US Patent:

5793458, Aug 11, 1998

Filed:

Dec 18, 1996

Appl. No.:

8/768502

Inventors:

John A. VanderPloeg - Highland MI
Gang Xu - Northville MI
Adiel Abileah - Farmington Hill MI

Assignee:

OIS Optical Imaging Systems, Inc. - Northville MI

International Classification:

G02F 11335

US Classification:

349118

Abstract:

A normally white twisted nematic liquid crystal display is provided for outputting improved viewing characteristics which are defined by high contrast ratios and reduced inversion. The display includes both positive and negative retardation films, the negative films being biaxial and defined by n. sub. x >n. sub. y >n. sub. z in certain embodiments where the "z" direction is substantially perpendicular to the film plane and the "x" and "y" directions are substantially parallel to the film plane. By providing the positive and biaxial negative retarders with specific retardation values and/or ratios, improved viewing characteristics are provided. According to other embodiments, a positive and a negative (uniaxial or biaxial) retarder may be provided on only one side of the liquid crystal layer.

US Patent:

6567143, May 20, 2003

Filed:

Apr 28, 1998

Appl. No.:

09/066827

Inventors:

John A. VanderPloeg - Highland MI
Gang Xu - Cupertino CA

Assignee:

Guardian Industries Corp. - Auburn Hills MI

International Classification:

G02F 11335

US Classification:

349120, 349118

Abstract:

A normally white twisted nematic (TN) liquid crystal display (LCD) outputs improved viewing characteristics which are defined by high contrast ratios and/or reduced inversion. The display includes a pair of negative tilted retarders located on opposite sides of the liquid crystal layer, each of the tilted retarders including a tilt or incline angle which varies throughout the thickness of the layer. Additionally, one or two negative uniaxial or biaxial retarders are provided. As a result of the particular orientations, alignments, and retardation values described in the different embodiments herein, the display exhibits improved contrast and reduced inversion, often in the same viewing areas. Contrast ratio in the positive vertical viewing zone is especially improved.

US Patent:

6578536, Jun 17, 2003

Filed:

Dec 18, 2001

Appl. No.:

10/025579

Inventors:

William Peter Donohue - Milford MI
Alfred Edmund Lynn - Troy MI
Gang Xu - Westlake OH
Vijay Garg - Canton MI

Assignee:

Visteon Global Technologies, Inc. - Dearborn MI

International Classification:

F01L 134

US Classification:

123 9018, 123 9015, 123 9011, 123 9012, 25112901, 25112916

Abstract:

The present invention provides an actuator assembly for operating a cylinder valve of an internal combustion engine. The actuator assembly achieves fast response times by utilizing a solenoid actuator that contains an armature element formed of a powder metal. A valve system that utilizes two of the actuator assemblies in conjunction with a cylinder valve is also provided.

US Patent:

6631633, Oct 14, 2003

Filed:

Nov 2, 2000

Appl. No.:

09/704885

Inventors:

Vijay K. Garg - Canton MI
Zheng Lou - Plymouth MI
Alfred E. Lynn - Troy MI
David Jorgensen - Chelsea MI
Gang Xu - Canton MI

Assignee:

Visteon Global Technologies, Inc. - Dearborn MI

International Classification:

G01L 2700

US Classification:

73 157, 137 1, 25112916

Abstract:

A variable force solenoid valve assembly generally includes a coil, magnetic pole, armature, and one or more variable size air gaps that are disposed within the solenoid. The solenoid may be calibrated by first energizing the solenoid coils and determining a corresponding desired hydraulic pressure, measuring the actual hydraulic pressure, and adjusting the magnetic flux until the desired output pressure is achieved.

US Patent:

57150281, Feb 3, 1998

Filed:

Nov 7, 1996

Appl. No.:

8/744950

Inventors:

Adiel Abileah - Farmington Hills MI
Patrick F. Brinkley - Bloomfield MI
Gang Xu - Northville MI

Assignee:

OIS Optical Imaging Systems, Inc. - Northville MI

International Classification:

G02F 11347
G02F 11335

US Classification:

349117

Abstract:

A liquid crystal display and corresponding method are provided for reducing display image reflections off of a reflection point on an external medium (e. g. cockpit canopy or automotive windshield). A retarder is provided on the front side of the display so that the polarization direction of the display image is substantially parallel to the plane of incidence when the image reaches the reflection point. Additionally, the angle of incidence. THETA. sub. i is substantially matched to the Brewster angle. THETA. sub. p in order to maximize the reduction of reflection at the reflection point. The retarder has a retardation value of from about 220-320 nm according to certain embodiments, and is a 1/2. lambda. retarder according to preferred embodiments.

US Patent:

60233176, Feb 8, 2000

Filed:

Mar 31, 1998

Appl. No.:

9/052001

Inventors:

Gang Xu - Northville MI
John A. VanderPloeg - Highland MI

Assignee:

OIS Optical Imaging Systems, Inc. - Northville MI

International Classification:

G02F 11335

US Classification:

349120

Abstract:

A normally white twisted nematic liquid crystal display is provided for outputting improved viewing characteristics which are defined by high contrast ratios and reduced inversion. The display includes both positive and negative retardation films, the negative films being defined by n. sub. x =n. sub. y >n. sub. z where the "z" direction is substantially perpendicular to the film plane and the "x" and "y" directions are substantially parallel to the film plane. According to certain embodiments, a pair of positive and a pair of negative retardation films are provided such that the two positive retarders sandwich both the liquid crystal layer and the negative retarders therebetween. By providing the positive and negative retarders with specific retardation values and/or ratios, improved viewing characteristics are provided.

US Patent:

61695904, Jan 2, 2001

Filed:

Jun 24, 1997

Appl. No.:

8/881667

Inventors:

Adiel Abileah - Farmington Hills MI
Gang Xu - Royal Oak MI
Patrick F. Brinkley - Bloomfield MI

Assignee:

OIS Optical Imaging Systems, Inc. - Northville MI

International Classification:

G02F 11335

US Classification:

349120

Abstract:

A multi-colored pixel for a twisted nematic liquid crystal display including red, green, and blue subpixels, wherein each subpixel includes a pair of substrates, a pair of polarizers, opposing electrodes, and a color personalized retardation film which compensates for the different wavelength of each color. The personalized retardation films of the different color subpixels results in elimination of the multi-gap approach and substantially eliminates the problem of different color leakages at different viewing angles, including normal. Also, one polymer based element, preferably a polyimide, functions as both a color filter and a retardation film in certain embodiments of this invention.

US Patent:

57370486, Apr 7, 1998

Filed:

Nov 12, 1996

Appl. No.:

8/747671

Inventors:

Adiel Abileah - Farmington Hills MI
Gang Xu - Royal Oak MI

Assignee:

OIS Optical Imaging Systems, Inc. - Troy MI

International Classification:

G02F 11335

US Classification:

349121

Abstract:

A normally white liquid crystal display is provided with a positively birefringent uniaxial retardation film having a retardation value of from about 100-200 nm. The retardation film is provided on one side of the liquid crystal layer, the liquid crystal being sandwiched between a pair of orientation or buffing films which orient the liquid crystal molecules adjacent thereto in predetermined directions. The optical axis of the retardation film is rotated from about 2. degree. -20. degree. , most preferably from about 6. degree. -10. degree. relative to the buffing direction on the opposite side of the liquid crystal layer. This rotation of the retardation film optical axis allows for the high contrast ratio viewing zone of the display to be shifted vertically into either the positive or negative vertical viewing region depending upon the direction of rotation of the retardation film optical axis. Alternatively, biaxial retardation films having similar retardation values may be utilizied according to the teachings of this invention.