Claims
- 1. In a field emission display device, a method of equalizing readsorption at emitter sites of contaminant species desorbed from a faceplate comprising steps of:determining a time average current for each of the emitter sites, wherein the time integrated flux of contaminant species is substantially the same at each of the emitter sites; and, driving each emitter site with the determined time average current.
- 2. The method of claim 1, further including determining the angular distribution of the desorbed species and determining the resulting accumulation of the desorbed species at the emitter sites.
- 3. The method of claim 1, further including controlling the time average current by controlling the instantaneous emission current.
- 4. The method of claim 1, wherein the each emitter is driven with a constant instantaneous current.
- 5. The method of claim 1, wherein the driving of each emitter site is performed in conjunction with an animated contrast image displayed on said display.
- 6. The method of claim 1, wherein the driving of each emitter site is done with a constant current for the field emission display device as a whole.
- 7. The method of claim 1, wherein the time average current is controlled using a duty cycle applied to each emitter.
- 8. The method of claim 4, wherein each row of pixels is driven in turn.
- 9. A field emission display device comprising:a plurality of contaminant species; a plurality of emitters; and a faceplate having a surface upon which at least one of said contaminant species has a sufficiently high mobility thereon to provide replacement migration.
- 10. The field emission display of claim 9, wherein said surface upon which at least one of said contaminant species has a sufficiently high mobility thereon to provide replacement migration, is provided by an applied coating.
- 11. The field emission display of claim 10 wherein said contaminant species increases the work function at the surface of the emitters.
- 12. The field emission display of claim 10 wherein said contaminant species decreases the work function at the surface of the emitters.
- 13. The field emission display of claim 10, further including a getter.
- 14. The field emission display of claim 13, wherein the contaminant species having the lowest getter affinity has sufficiently high mobility on said surface to provide replacement migration.
- 15. The field emission display of claim 10, wherein the dominant contaminant species has sufficiently high mobility on said surface to provide replacement migration.
- 16. The field emission display of claim 15, wherein said dominant contaminant species is an organic compound.
- 17. The field emission display of claim 16, wherein said dominant contaminant species is methane.
- 18. In a field emission display device having a gate and an emitter, wherein the emission current is a function of a gate-to-emitter voltage, a method for adjusting a gate-to-emitter voltage to achieve a predetermined emission current comprising:acquiring a plurality of data pairs for the gate-to-emitter voltage and emission current; using said plurality of data pairs, solving for the parameters of the Fowler-Nordheim equation; computing a required gate-to-emitter voltage for the predetermined emission current using the Fowler-Nordheim equation and the parameters; and, applying the required gate-to-emitter voltage.
- 19. The method of claim 18 wherein said plurality of data pairs is limited to two data points.
- 20. The method of claim 19 wherein said parameters are solved for by a curve fit using more than two data pairs.
Parent Case Info
This patent application is a continuation-in-part of, and claims priority to, U.S. application Ser. No. 09/767,329, filed Jan. 22, 2001, now U.S. Pat. No. 6,459,209 which is a continuation of U.S. application Ser. No. 09/493,698, filed Jan. 28, 2000, now U.S. Pat. No. 6,307,351 which is a continuation of U.S. application Ser. No. 09/144,675, filed Aug. 31, 1998 now U.S. Pat. No. 6,104,139.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
6013980 |
Goel et al. |
Jan 2000 |
A |
6147450 |
Fritz et al. |
Nov 2000 |
A |
6409564 |
Browning et al. |
Jun 2002 |
B1 |
Continuations (2)
|
Number |
Date |
Country |
Parent |
09/493698 |
Jan 2000 |
US |
Child |
09/767329 |
|
US |
Parent |
09/144675 |
Aug 1998 |
US |
Child |
09/493698 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/767329 |
Jan 2001 |
US |
Child |
10/025084 |
|
US |