Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1997-12-15
2000-05-30
Font, Frank G.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
315164, 315300, 315302, G09G 310
Patent
active
060694513
ABSTRACT:
A field emission display ("FED") is disclosed having a gray scale range. Input into the FED, initially, is an analog signal input. The FED, by employing an analog to pulse width converter, subsequently converts the analog input to a pulse width output, the width of which directly correlates to the amplitude of the analog input signal. To achieve this design, the analog to pulse width converter comprises a sampler for sampling the analog signal at a predetermined frequency, thereby creating a plurality of samples corresponding to the input voltage. Further, the converter comprises means for holding each of the samples. The output of the holding means is subsequently coupled with a load responsive to the output of the holding means. In one embodiment of the present invention, this load comprises a voltage controlled resistance. The voltage controlled resistance can comprise a convertor for converting each of the samples to a current source and a load for creating a voltage ramp. The voltage ramp is subsequently input to a buffer for comparing the load output with a predetermined threshold. By this design, a pulse width signal is thereby created, the width of which ranges between a minimum and a maximum value, the minimum and the maximum values corresponding to the gray scale range.
REFERENCES:
patent: 5424618 (1995-06-01), Bertenshaw et al.
Hush Glen E.
Rotzoll Robert R.
Bachand William R.
Font Frank G.
Micro)n Technology, Inc.
Ratliff Reginald A.
Stern Robert J.
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