Method and apparatus for controlling the drive frequency of a LE

Details Method and apparatus for controlling the drive frequency of a LE Method and apparatus for controlling the drive frequency of a LE

1994-07-25

1996-10-29

Zele, Krista M.

Telephonic communications

Substation or terminal circuitry

Visual signalling

379 56, 379 57, 379 63, 379376, 379 96, H04M 100

Patent

active

055704212

ABSTRACT:
A drive frequency control method and apparatus for use in a radio receiver, such as a paging unit. The paging unit includes an LED for informing a user of an incoming call, and a drive frequency controller coupled to the LED for controlling the luminance of the LED by supplying a certain amount of electric current to the LED. The luminance of the LED is based on the amount of ambient light detected by an illumination detector. The detected illuminance information is sent to a CPU, which controls the drive frequency generator accordingly. The drive frequency generator generates a drive signal which is provided via an amplifier to an on-off switching transistor. The transistor, in turn, controls the amount of electric current that is supplied through a storage/discharge device and the LED, thereby controlling the luminance of the LED.

REFERENCES:
patent: 3849979 (1974-11-01), Tanji
patent: 4280021 (1981-07-01), Yuan
patent: 4339632 (1982-07-01), Early et al.
patent: 4379210 (1983-04-01), Sparber
patent: 4726060 (1988-02-01), Itoh et al.
patent: 4818982 (1989-04-01), Kuehn et al.
patent: 4866430 (1989-09-01), Chek
patent: 4951311 (1990-08-01), Sterr
patent: 4953205 (1990-08-01), Yang
patent: 4982424 (1991-01-01), Saito et al.
patent: 5280523 (1994-01-01), Lee
patent: 5315695 (1994-05-01), Saito et al.
patent: 5327486 (1994-07-01), Wolff et al.
patent: 5329288 (1994-07-01), Kim
patent: 5384832 (1995-01-01), Zimmerman et al.
patent: 5406305 (1995-04-01), Shimomura et al.

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