Jessica V Stevens

US Patent:

6392356, May 21, 2002

Filed:

May 14, 2001

Appl. No.:

09/859314

Inventors:

Jessica L. Stevens - San Mateo CA

Assignee:

Telegen Corporation - San Mateo CA

International Classification:

H01J 3112

US Classification:

3151693, 3151694, 313495, 313496

Abstract:

The present invention teaches a matrix addressed flat panel display device. A substrate is contained within a vacuum envelope with a translucent pane to allow viewing of the image. The substrate panel has one side covered with phosphor-coated anode pads, and the other side with driver circuitry for selectively activating individual conductive anode pads by electric connections using vias or similar electric connections through the substrate. An electron source such as thermionic filaments are disposed between the phosphor-coated anode pads and the translucent pane.

US Patent:

20010048419, Dec 6, 2001

Filed:

Nov 29, 2000

Appl. No.:

09/725590

Inventors:

Jessica Stevens - San Mateo CA, US

International Classification:

G09G003/36

US Classification:

345/089000

Abstract:

A programmable pulse width modulation generator circuit and method for generating a pulse width modulated signal with a variable duty cycle. The generator circuit includes a data loading circuit for receiving a data word representing the desired duty cycle of the pulse width modulated signal to be generated. The data word comprises a plurality of data bits, each bit having at least one of a selected or unselected state. The generator circuit also includes a generating circuit coupled to data loading circuit for receiving a plurality of periodic pulse width modulated signals, and for generating a pulse width modulated signal by combining each constituent pulse width modulated signals that correspond to a data bit in the data word that indicates the selected state.

US Patent:

20020015026, Feb 7, 2002

Filed:

May 8, 2001

Appl. No.:

09/851762

Inventors:

Jessica Stevens - San Mateo CA, US

International Classification:

G09G005/00

US Classification:

345/204000

Abstract:

A vacuum cathodoluminescent display device, also called a vacuum fluorescent display, with filamentary cathodes parallel to control gate wires and a matrix drive system utilizing anode based phosphor stripes adjacent and perpendicular to the control electrode gate wires, is introduced with tunable control electrode gate wire pairs via an unbalanced voltage drive which optimizes to the maximum the design and actual performance of the display device. Specifically, the tunable unbalanced control electrode voltage drive leads to the following decisive advantages over the prior art: 1) Increasing the efficiency of emission of electrons from the cathode 2) Efficiently bunching, guiding and focusing the electron stream emitted by the cathode into the activated gate and on to the assigned phosphor pixels 3) Avoiding electron interception and heating of active and inactive gate wires. 4) Avoiding electron termination into non-assigned phosphor pixels 5) Permitting low voltage, V100 volts and high voltage, V 100 volts, operation 6) Permitting the increase of the number of gates per filamentary cathode, thereby decreasing the number of cathodes and power consumption in the device 7) Minimizing the number of driver signals required to drive the gates, in the tunable unbalanced drive mode, to a number equal to half the gates in a cathode module.

US Patent:

20020063672, May 30, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/726074

Inventors:

Jessica Stevens - San Mateo CA, US

International Classification:

G09G003/36

US Classification:

345/089000, 345/690000

Abstract:

A circuit and method for generating pulse width modulated signal from an analog video signal. The circuit includes a first circuit portion that includes a first switch, a voltage storage device that stores a portion of the analog video signal as a voltage value according to the first switch activated according to sample time information within a portion of time of the analog video signal, and a second switch that outputs the stored voltage value when activated according to a next portion of time of the analog video signal. The circuit also includes a second circuit portion that converts the outputted voltage value into a pulse width modulated signal.

US Patent:

20020063728, May 30, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/725622

Inventors:

Jessica Stevens - San Mateo CA, US

International Classification:

G09G005/10
H04N005/66

US Classification:

345/690000

Abstract:

A circuit and method for generating pulse width modulated signal from an analog video signal. The circuit includes a pulse width modulated signal generating circuit portion and a voltage sampling circuit portion. The voltage sampling circuit portion includes a first switch, a voltage storage device for storing a portion of the analog video signal as a voltage value according to the first switch activated according to sample time information within a portion of time of the analog video signal, and a second switch for outputting the stored voltage value to the pulse width modulated signal generating circuit portion when activated according to a next portion of time of the analog video signal. When the stored voltage value is outputted to the pulse width modulated signal generating circuit, the pulse width modulated signal generating circuit portion for generating a pulse width modulated signal by comparing the outputted voltage value to a waveform.

US Patent:

20020064223, May 30, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/726103

Inventors:

Jessica Stevens - San Mateo CA, US

International Classification:

H03K007/08
G09G005/10

US Classification:

375/238000

Abstract:

A circuit and method for generating a pulse width modulated signal. The circuit includes a clock that generates a clock signal having a plurality of clock pulses, the clock pulses being spaced by weighted intervals during a signal period and a register that receives a data word with a plurality of data bits, and that generates a pulse width modulated signal by comparing each data bit to a corresponding one of the clock pulses.

US Patent:

59493950, Sep 7, 1999

Filed:

Dec 21, 1995

Appl. No.:

8/576641

Inventors:

Jessica L. Stevens - San Mateo CA
W. Edward Naugler - Menlo Park CA

Assignee:

Telegen Corporation - San Mateo CA

International Classification:

H01J 2900

US Classification:

345 75

Abstract:

A flat-panel, matrix-type visible light emissive display which has an electron source positioned at the back panel for providing a background of electrons. An electron gating grid having a number of conductive filaments is positioned before the front panel and exposed to the electron source. A display array with a number of parallel conductive phosphor stripes for generating visible radiation when bombarded with electrons is arranged between the electron gating grid and the front panel. The display has a control unit for applying an accelerating voltage V. sub. 3 to the conductive phosphor stripes, and an arrangement for selectively applying a blocking voltage V. sub. 2 and a gating voltage V. sub. 1 to the conductive filaments, such that gating voltage V. sub. 1 is simultaneously applied to an adjacent filament pair to pass the electrons in-between the adjacent filament pair, such that the electrons which pass are accelerated to impact and produce visible radiation on a segment of the active stripe corresponding to the projection on the active stripe of the gating distance d between said conductive filaments.

US Patent:

58313974, Nov 3, 1998

Filed:

Dec 2, 1996

Appl. No.:

8/753825

Inventors:

Jessica L. Stevens - San Mateo CA
W. Edward Naugler - Menlo Park CA

Assignee:

Telegen Corporation - Redwood City CA

International Classification:

H01J 2970
H01J 2972

US Classification:

315366

Abstract:

A deflecting apparatus for a flat-panel display having an evacuated display housing and a display screen. The display has phosphor stripes or dots for generating visible radiation when bombarded with electrons when accelerating voltage V. sub. 1 is applied to stripes. The invention provides for an elongate electron source positioned in the back of the evacuated display housing for emitting electrons which are guided to the display screen through an anode grid or an electron gating grid located before the display screen. The deflecting apparatus for rendering the beam of electrons emitted from the elongate electron source uniform has a deflecting element or unit which is positioned at the back of the display housing and produces a spatially parabolic potential under the influence of steering potential V. sub. 4. This spatially parabolic potential forces the electrons moving in the direction of the anode grid or gating grid to form a uniform beam. The deflecting apparatus of the invention can also be used to focus electrons to a narrow beam forming a "knife edge".