Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-07-28
1998-02-24
Powell, Mark R.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
313495, H01J 130, H01J 1924
Patent
active
057215600
ABSTRACT:
A method for controlling a field emission display to reduce emission to grid during turn on and turn off is provided. A field emission display (FED) includes emitter sites formed on a baseplate; a grid for controlling electron emission from the emitter sites; a display screen for collecting electrons to form an image and a power supply. In order to reduce emission to grid during turn on, the display screen is enabled by the power supply prior to enabling of the emitter sites. An anode-baseplate voltage differential is thus established prior to electron emission. For turn on, the method includes varying the capacitances of the control circuits for the display screen and grid such that a time constant (RC) for the grid is larger than a time constant (RC) for the display screen. Alternately the method of the invention can be implemented during turn on using software, using time delay circuit components, or using an emitter site control circuit to control electron flow to the emitter sites. During turn off, the electron emission and anode-baseplate voltage differential are eliminated while a path to ground is provided for the grid.
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Cathey, Jr. David A.
Howell Steven
Hush Glen E.
Lewis William
Gratton Stephen A.
Micron Display Technology Inc.
Powell Mark R.
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