Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-05-22
2011-11-22
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S214000, C315S169300
Reexamination Certificate
active
08063854
ABSTRACT:
A video display device comprises a plurality of light emitting elements arranged in a matrix having rows and columns; a plurality of first current modulators each of which is associated to one of said light emitting elements for drawing a feed current of programmable intensity for the associated light emitting element from a circuit node associated to each of said columns; a current generator controlled by video data representative of desired luminosities of said light emitting elements for supplying a first current (IDATA)to said circuit node, the intensity of which is representative of a desired luminosity of at least one of said light emitting elements; the circuit node having a specific voltage level when the intensity supplied by said current generator is drawn from the current node by the first current modulator associated to said at least one light emitting element; a second current modulator for supplying a second current (I10) to said circuit node; a comparator having inputs connected to said circuit node and to a reference terminal which is constantly held at said specific voltage level and an output connected to a control input of said second current modulator, whereby the second current (I10) from said second current modulator is controlled so as to yield said specific voltage level at the circuit node.
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European Search Report Sep. 26, 2006.
Gagnot Dominique
Le Roy Philippe
Martin Pierrick
Harris Dorothy
Hjerpe Richard
Navon Jeffrey M.
Shedd Robert D.
Thomson Licensing
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