Light-emitting element drive circuit

Details Light-emitting element drive circuit Light-emitting element drive circuit

2005-11-15

2005-11-15

Mengistu, Amare (Department: 2673)

Computer graphics processing and selective visual display system

Plural physical display element control system

Segmented display elements

C345S212000, C345S214000

Reexamination Certificate

active

06965357

ABSTRACT:
A light-emitting element drive circuit capable of controlling the drive current of a light-emitting element in consideration of changes in a threshold value of the light-emitting element. A laser diode1emits light in accordance with a bias current Ib of a bias current drive circuit2and a light-emitting current Ip of a data current drive circuit3. A photodiode4outputs a monitor current Im that corresponds to the optical output of the laser diode1. A bias current feedback circuit8detects a change in the threshold current in accordance with the current Im, and outputs a control signal CS1. The bias current drive circuit2generates a bias current Ib that corresponds to the threshold current Ith of the laser diode1after the change. A light-emitting current feedback circuit9detects a change in the optical output of the laser diode1in accordance with the current Im, and outputs a controls signal CS2. The data current drive circuit3generates a light-emitting current Ip relative to a pre-determined optical output of the laser diode1in accordance with the control signal CS2.

REFERENCES:
patent: 4307469 (1981-12-01), Casper et al.
patent: 4518986 (1985-05-01), Hinn et al.
patent: 5565870 (1996-10-01), Fukuhara et al.
patent: 2001/0052941 (2001-12-01), Matsunaga et al.

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