Self light emitting type display module, electronic...

Details Self light emitting type display module, electronic... Self light emitting type display module, electronic...

2008-01-08

2008-01-08

Lieu, Julie Bichngoc (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S657000, C340S664000, C362S093000, C324S500000

Reexamination Certificate

active

07317400

ABSTRACT:
Reverse bias voltage VM is applied to any one of self light emitting elements arranged on a light emitting panel1under detection mode. Current corresponding to weak current flowing to the element is supplied to a transistor Q3by the operation of a current mirror circuit comprised of transistors Q1, Q2. The current mirror circuit is formed with the transistor Q3as a control side current source transistor and transistors Q4to Q7as a controlled side current source transistor. The sizes of the controlled side current source transistors Q4to Q7are set to, for example, 1:2:4:8 with respect to the control side current source transistor Q3so as to construct current amplifying means. Current value amplified by a current comparison type comparator7is compared with current value from a reference current source8and its output is latched by a latch circuit9and stored in a data register10. If a weak current over a predetermined value flows when reverse bias voltage is applied to the self light emitting element, it is determined that a possibility that the self light emitting element turns into a light emission fault is high and notifying means is driven appropriately using data stored in the data register10.

REFERENCES:
patent: 7075766 (2006-07-01), Moyer et al.
patent: 2002/0141125 (2002-10-01), Stafford
patent: 2002/0163514 (2002-11-01), Nagai et al.
patent: 2005/0196892 (2005-09-01), Yamagata et al.
patent: 3437152 (2003-06-01), None
patent: WO 02/093186 (2002-11-01), None
European Search Report dated Aug. 17, 2006 issued in corresponding European Application No. EP 05 00 8547.

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