Constant current driving device, backlight light source...

Details Constant current driving device, backlight light source... Constant current driving device, backlight light source...

2005-04-15

2008-09-16

Lefkowitz, Sumati (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

Reexamination Certificate

active

07425943

ABSTRACT:
A constant current driving device for constant current driving of a plurality of elements connected in series with each other by a pulse width modulation constant current driving circuit includes: switching elements respectively connected in parallel with the plurality of elements connected in series with each other; a control circuit for performing control to bypass a driving current flowing through the other elements than an arbitrary element to be measured via the respective switching elements and pass a measuring driving current through only the element to be measured; and a detecting circuit for identifying an element at a faulty position by detecting the driving current flowing through the plurality of elements connected in series with each other.

REFERENCES:
patent: 6153980 (2000-11-01), Marshall et al.
patent: 7317287 (2008-01-01), Blumel
patent: 2007/0159750 (2007-07-01), Peker et al.

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