Fed display row driver with chip-to-chip settling time matching

Details Fed display row driver with chip-to-chip settling time matching Fed display row driver with chip-to-chip settling time matching

1998-01-30

2000-03-21

Brier, Jeffery

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345204, G09G 332, G09G 500

Patent

active

06040809&

ABSTRACT:
A device for and method of eliminating objectionable bands of uneven brightness in flat panel field emission displays (FEDs). Within the FED screen, a matrix of rows and columns is provided and emitters are situated within each row-column intersection. Rows are activated sequentially by row drivers and discrepancies in row driver settling times among the row drivers cause bands of uneven brightness on the display screen. The present invention normalizes row settling time of row driver integrated circuits that can be variant due to differences in semiconductor processing and manufacturing. The present invention includes specialized circuitry coupled to the row drivers for sensing an output of the row driver and determining a difference between the output and a threshold at a particular time before the output has completely settled to a target voltage. In response to the difference, gate voltages of output transistors within the row driver are altered in order to adjust the settling time of the row driver to match a target settling time. As a result, the settling times of all the row drivers in the FED screen are matched. Consequently, the brightness variation problem is eliminated.

REFERENCES:
patent: 5294919 (1994-03-01), Harju
patent: 5488386 (1996-01-01), Yamagishi et al.
patent: 5541473 (1996-07-01), Duboc, Jr. et al.
patent: 5559389 (1996-09-01), Spindt et al.
patent: 5564959 (1996-10-01), Spindt et al.
patent: 5578899 (1996-11-01), Haven et al.
patent: 5610667 (1997-03-01), Hush
patent: 5638085 (1997-06-01), Hush et al.
patent: 5847515 (1998-12-01), Lee et al.
patent: 5854615 (1998-12-01), Hush

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