Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-01-03
2006-01-03
Liang, Regina (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S082000
Reexamination Certificate
active
06982689
ABSTRACT:
A light-emitting element drive apparatus for achieving light-emission control of a light-emitting element with high speed and high accuracy includes a monitoring photodiode11that receives light emitted from a laser diode12to generate a current, Im, that corresponds to the optical output thereof. The current Im is converted to a monitor voltage Vm by a current-to-voltage conversion circuit13, and its waveform is smoothed by a first low-pass filter14to produce a monitoring average value Vav that has a ripple component. A pre-modulated optical power setup voltage Vps generated by a variable direct-current voltage source25is modulated by a pulse modulation circuit22based on a data signal delayed by a predetermined time, and smoothed via a second low-pass filter23and a third low-pass filter24. Then, an optical power setup voltage Vref that has a nearly similar amplitude and ripple component is generated in synchronization with the average value Vav.
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Hoshi Tsukasa
Sakamoto Hiroshi
Bergere Charles
Dinh Duc Q
Freescale Semiconductor, INC
Liang Regina
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