Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-01-31
2009-08-18
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S061000, C345S062000, C345S690000
Reexamination Certificate
active
07576711
ABSTRACT:
Disclosed is a contrast compensating apparatus for a PDP module and method thereof that can compensate for the deterioration of contrast due to the decrease of the number of sustain pulses according to an APL adjustment. The apparatus includes an APL calculating unit, a sustain pulse generating unit, a histogram analyzing unit for calculating a maximum value M of brightness repeating numbers of the video signal, a minimum brightness value W1and a maximum brightness value W2of a brightness repetition distribution area that includes the maximum value M of the brightness repeating numbers, a comparing unit, a contrast compensating unit for comparing an output of the comparing unit with a first setting value, comparing the maximum value of the brightness repeating numbers from the histogram analyzing unit with a second setting value, and calculating a contrast compensation value using the minimum brightness value W1and the maximum brightness value W2according to results of comparison, and a mixer for feeding an output of the contrast compensating unit back to an input terminal of the video signal.
REFERENCES:
patent: 2005/0122287 (2005-06-01), Nishitani et al.
patent: 2006/0284899 (2006-12-01), Kimura
patent: 2007/0216816 (2007-09-01), Aoki et al.
patent: 1 014 330 (2000-06-01), None
patent: 1 321 920 (2003-06-01), None
Birch & Stewart Kolasch & Birch, LLP
Hjerpe Richard
LG Electronics Inc.
Shapiro Leonid
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