Display apparatus with improved suppression of pseudo-contours

Details Display apparatus with improved suppression of pseudo-contours Display apparatus with improved suppression of pseudo-contours

2005-04-19

2005-04-19

Lao, Lun-yi (Department: 2673)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S063000, C345S077000, C345S596000

Reexamination Certificate

active

06882351

ABSTRACT:
A display apparatus using a subfield drive system suppresses pseudo-contours in moving pictures by identifying areas with smoothly varying gradation values, determining the minimum and maximum gradation values in each such area, and processing the area so that all gradations in the range from the minimum gradation value to the maximum gradation value can be displayed without altering the states of any subfields having durations longer than a predetermined duration. This is accomplished by selecting a subfield sequence free of such state alterations and using the selected subfield sequence to display the area, or by modifying the gradation values in the area so as to avoid gradations at which such state alterations occur.

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