Analog driver for LED or similar display element

Details Analog driver for LED or similar display element Analog driver for LED or similar display element

1998-03-19

2000-08-01

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 82, 345 83, 345 46, G09G 334, G09G 332, G09G 314

Patent

active

060973609

ABSTRACT:
The analog driver for a display device which is controlled by current, such as an LED, includes a strobed analog input which charges a storage capacitor. The voltage across the storage capacitor is fed to the positive input of a comparator. The negative input of the comparator receives the voltage from a feedback resistor which is in series with the drive voltage, the drive FET (with a gate connected to the output of the comparator) and the light emitting device. Additionally, a reset FET is provided in parallel with the storage capacitor. Displays can be manufactured by a series of panels, each of the panels including an array of these drivers and light emitting devices, along with appropriate control circuitry.

REFERENCES:
patent: 4048632 (1977-09-01), Spence
patent: 4298869 (1981-11-01), Okuno
patent: 5708452 (1998-01-01), Takahashi
patent: 5936599 (1999-08-01), Reymond

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