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FED DISPLAY COLOR CONTROL USING VARIABLE WELL SIZES

IP.com Disclosure Number: IPCOM000009630D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-05
Document File: 1 page(s) / 71K

Publishing Venue

Motorola

Related People

Johann Trujillo: AUTHOR [+2]

Abstract

Achieving proper color balance in field emis- sion displays is a challenge due to the unmatched efficiency of the phosphors. In general, blue phos- phors are much less efficient than red or green phos- phors thus they require more current to produce suf- ficient light. The following proposes a method of fabricating field emitters pixels that will compensate for the differences in efftciency by controlling the gate opening and thus the current emitted from a particular subpixel at a given gate voltage.

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0 M M-ROLA Technical Developments

FED DISPLAY COLOR CONTROL USING VARIABLE WELL SIZES

by Johann Trujillo and CG Xie

  Achieving proper color balance in field emis- sion displays is a challenge due to the unmatched efficiency of the phosphors. In general, blue phos- phors are much less efficient than red or green phos- phors thus they require more current to produce suf- ficient light. The following proposes a method of fabricating field emitters pixels that will compensate for the differences in efftciency by controlling the gate opening and thus the current emitted from a particular subpixel at a given gate voltage.

  It is well known that the diameter of the gate opening in a field emission device has a strong influence on the amount of current that will be emit- ted at a particular gate voltage. It is also possible to predict the expected amount of current. Thus, one way to control color balance is by placing emitters with different well sizes under each color phosphor. By doing this, the current from each subpixel can be adjusted to balance efficiency of the different phos- phors so that any desired white balance can be achieved.

  Table 1 shows the relative current efficiency for achieving a D64 white color balance for the given set of phosphors.

  Table 1: Ratio of current required for obtaining a D64 white with the given phosphor set.

Phosphor Color % current for D64 white

P58 Green 0.365

P47 Blue 0.550

P56 Red 0.085

  It can be assumed that a linear change in gate...