Steven M Nguyen

US Patent:

8643296, Feb 4, 2014

Filed:

Nov 22, 2011

Appl. No.:

13/302991

Inventors:

Cristiano Bazzani - Irvine CA, US
Fabio Gozzini - Newport Beach CA, US
Steven Van Nguyen - Garden Grove CA, US

Assignee:

Mindspeed Technologies, Inc. - Newport Beach CA

International Classification:

H05B 37/02

US Classification:

315209R, 315192, 315210

Abstract:

A system is disclosed to automatically establish proper biasing for light sources in a color mixed projection system having multiple light sources which are active at the same time. Responsive to a feedback signal, a single DC-DC converter generates the bias voltage for the light sources. Comparators compare a headroom signal for each light source to a reference value to generate comparator output signals. The comparator output signals are processed by a channel selector and a digital filter/DAC module. The channel selector controls a switch to selectively provide and combine a headroom signal with an output of the digital filter/DAC module to create the feedback signal. By monitoring each headroom value, the bias voltage is adjusted, based on the feedback signal, until every headroom signal reaches the reference value thereby achieving sufficient biasing for every active light source in the color mixed projection system.

US Patent:

20210096401, Apr 1, 2021

Filed:

Sep 30, 2020

Appl. No.:

17/039023

Inventors:

- Lowell MA, US
Ronald Scott Karfelt - Horseheads NY, US
Steven Nguyen - Garden Grove CA, US
Nicholas Karfelt - Horseheads NY, US
Saman Jafarlou - Irvine CA, US
Swetha Babu - San Jose CA, US

International Classification:

G02F 1/01
H05B 1/02
H05B 3/06

Abstract:

The present disclosure relates to optical phase modulation devices. The optical phase modulation devices may include a heater resistance which induces a phase change and control systems and methods of controlling the induced phase change.

US Patent:

20140111114, Apr 24, 2014

Filed:

Dec 23, 2013

Appl. No.:

14/139725

Inventors:

- NEWPORT BEACH CA, US
Fabio Gozzini - Campbell CA, US
Steven Van Nguyen - Garden Grove CA, US

Assignee:

MINDSPEED TECHNOLOGIES, INC. - NEWPORT BEACH CA

International Classification:

H05B 37/02

US Classification:

315297

Abstract:

A system is disclosed to automatically establish proper biasing for light sources in a color mixed projection system having multiple light sources which are active at the same time. Responsive to a feedback signal, a single DC-DC converter generates the bias voltage for the light sources. Comparators compare a headroom signal for each light source to a reference value to generate comparator output signals. The comparator output signals are processed by a channel selector and a digital filter/DAC module. The channel selector controls a switch to selectively provide and combine a headroom signal with an output of the digital filter/DAC module to create the feedback signal. By monitoring each headroom value, the bias voltage is adjusted, based on the feedback signal, until every headroom signal reaches the reference value thereby achieving sufficient biasing for every active light source in the color mixed projection system.