Method and device for uniforming luminosity and reducing phospho

Details Method and device for uniforming luminosity and reducing phospho Method and device for uniforming luminosity and reducing phospho

1996-07-22

1998-01-13

Powell, Mark R.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

313391, 313398, 313422, 345 63, 345 77, 345204, 348687, G09G 336

Patent

active

057084513

ABSTRACT:
Nonuniformities of luminance characteristics in a field emission display (FED) are compensated pixel by pixel by storing a matrix of correction values, determined by testing, and by applying a corrected drive signal through the relative column drive stages. The individual pixel's correction factor that is applied to the corresponding video signal may be stored in digital or analog form in a nonvolatile memory array. Various embodiments are described including the use of a second updatable RAM array wherein pixel's correction factors are calculated and stored at every power-on to provide an opportunity of trimming-up the luminance of the display for compensating long term decline of luminance due to the phosphors ageing process.

REFERENCES:
patent: 4525653 (1985-06-01), Smith
patent: 4694225 (1987-09-01), Tomii et al.
patent: 5262698 (1993-11-01), Dunham
patent: 5440322 (1995-08-01), Prince et al.
patent: 5625373 (1997-04-01), Johnson

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