Matthias T Pfeiffer

US Patent:

6717561, Apr 6, 2004

Filed:

Jan 31, 2001

Appl. No.:

09/774984

Inventors:

Matthias Pfeiffer - Mesa AZ
Russell Flack - Scottsdale AZ
Anna Prakash - Mesa AZ

Assignee:

Three-Five Systems, Inc. - Tempe AZ

International Classification:

G09G 336

US Classification:

345 87, 345 94, 345 95, 345208, 345210

Abstract:

The present invention includes methods and apparatus for driving a cholesteric display system using a dynamic drive scheme. The dynamic drive scheme is used to drive the electrodes of the cholesteric display in order to provide desired pixel states. Pixel states are controlled by the voltage applied across the pixel. The present invention uses pulse width modulation (PWM) during the dynamic drive scheme in order to control the voltage applied across the pixels. PWM modulation may be used during any phase (e. g. , preparation phase, selection phase, evolution phase, and/or final phase) of the dynamic drive waveform depending on the needs of the cholesteric display system.

US Patent:

6727872, Apr 27, 2004

Filed:

Oct 8, 2001

Appl. No.:

09/972745

Inventors:

Matthias Pfeiffer - Mesa AZ
Terrence R. Klein - Averill Park NY
Russell J. Flack - Scottsdale AZ
John Karl Waterman - Mesa AZ

Assignee:

Brillian Corporation - Tempe AZ

International Classification:

G09G 336

US Classification:

345 87, 345 89

Abstract:

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a shift register, may be used to store and then grayscale levels to be written to adjacent pixels are compared and if a difference between these grayscale levels exceed a certain value then at least one of the grayscale levels is modified.

US Patent:

6731257, May 4, 2004

Filed:

Oct 8, 2001

Appl. No.:

09/972746

Inventors:

Matthias Pfeiffer - Mesa AZ
Terence R. Klein - Averill Park NY
Russell J. Flack - Scottsdale AZ
John Karl Waterman - Mesa AZ

Assignee:

Brillian Corporation - Tempe AZ

International Classification:

G09G 336

US Classification:

345 87, 345 89

Abstract:

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a plurality of shift registers, may be used to store grayscale levels of adjacent pixels which are compared and if a ratio between these grayscale levels exceeds a desire value then at least one of the grayscale levels is modified.

US Patent:

6972745, Dec 6, 2005

Filed:

Apr 26, 2004

Appl. No.:

10/832044

Inventors:

Matthias Pfeiffer - Mesa AZ, US
Terence R. Klein - Averill Park NY, US
Russell J. Flack - Scottsdale AZ, US
John Karl Waterman - Mesa AZ, US

Assignee:

Brillian Corporation - Tempe AZ

International Classification:

G09G003/36

US Classification:

345 89, 345 87, 345690

Abstract:

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a shift register, may be used to store and then grayscale levels to be written to adjacent pixels are compared and if a difference between these grayscale levels exceed a certain value then at least one of the grayscale levels is modified.

US Patent:

6999052, Feb 14, 2006

Filed:

Apr 27, 2004

Appl. No.:

10/832582

Inventors:

Matthias Pfeiffer - Mesa AZ, US
Terence R. Klein - Averill Park NY, US
Russell J. Flack - Scottsdale AZ, US
John Karl Waterman - Mesa AZ, US

Assignee:

Brillian Corporation - Tempe AZ

International Classification:

G09G 3/36

US Classification:

345 89, 345 87, 345690

Abstract:

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a plurality of shift registers, may be used to store grayscale levels of adjacent pixels which are compared and if a ratio between these grayscale levels exceeds a desire value then at least one of the grayscale levels is modified.

US Patent:

20020097395, Jul 25, 2002

Filed:

Sep 10, 2001

Appl. No.:

09/953575

Inventors:

Peter Smith - Chandler AZ, US
Dan Hoffman - Apache Junction AZ, US
Matthias Pfeiffer - Mesa AZ, US
Andrew Slater - Flower Mound TX, US
Ellis Erwin - Mesa AZ, US
Wyatt Hendrick - Scottsdale AZ, US

International Classification:

G01N021/00

US Classification:

356/239200

Abstract:

A LCD test system is provided for use in a high volume production environment. An automated test is performed that tests each LCD and provides a pass/fail indication. The automated test includes an image-sticking test that drives the test image based on a control voltage that corresponds to a maximum rate of change of brightness. The control voltage is determined by differentiating an electro-optic curve. The brightness difference between the test image and another test image is compared to predetermined threshold. The other test image may be a gray scale test. Alternatively, the image-sticking test may integrate brightness levels of odd and even frames, compare these results to predetermined thresholds. The test includes a color uniformity test in which average differences in peak reflectance and peak frequency within sections of the LCD are compared to predetermined thresholds for the pass/fall indication. The test includes a spatial distribution of defects test.

US Patent:

20230128359, Apr 27, 2023

Filed:

Oct 27, 2021

Appl. No.:

17/511948

Inventors:

- Roseville CA, US
Matthias T. Pfeiffer - Boulder CO, US

Assignee:

New Vision Display, Inc. - Roseville CA

International Classification:

G09G 3/20
G09G 3/34
G09G 3/36

Abstract:

The present disclosure relates to electronic displays and display components, specifically to a method of addressing more pixels with a smaller number of driver outputs while also allowing very narrow frames on three sides of a display. It further discloses a display driver integrated circuit capable of providing the signals required for the disclosed addressing method and display systems capable of being addressed by the disclosed method and display driver integrated circuit.

US Patent:

20230044071, Feb 9, 2023

Filed:

Aug 6, 2021

Appl. No.:

17/396473

Inventors:

- Roseville CA, US
Matthias T. Pfeiffer - Boulder CO, US

International Classification:

G02F 1/1335
F21V 8/00
G02F 1/133
B60R 13/10
B60Q 1/50

Abstract:

Systems and methods for IR readable transmissive and reflective displays are disclosed that do not suffer from a mirror-like appearance or undesirable dimming of the display due to sequential stacks of polarizers. The disclosed systems and methods use available IR LEDs in addition to, or in place of, visible light LEDs. An illuminator or integrator, which is a lightguide, is designed to maintain the polarization state of the light. The display can use a regular visible light, front polarizer and hence does not suffer from brightness reduction caused by an IR capable polarizer.