| **EXHIBIT 11**                                                                                                                                                                 |
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| **SI DIAMOND TECHNOLOGY, INC.**                                                                                                                                                |
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| **COMPUTATION OF INCOME (LOSS) PER COMMON SHARE**                                                                                                                              |
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|                                                                                                                                                                                |  | Three Months ended March 31, |   |
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|                                                                                                                                                                                |  | 2002 |  | 2001 |   |
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| Computation of income (loss) per common share:                                                                                                                                 |  |  |  |  |   |
|                                                                                                                                                                                |  |  |  |  |   |
|    Net income (loss) applicable to common stockholders                                                                                                               | $ |   (1,390,192)  |   $ | (1,307,553)  |   |
|                                                                                                                                                                                |  |  |  |  |   |
|    Weighted average number of common shares                                                                                                                          |  |  |  |  |   |
|          outstanding                                                                                                                   |  |   67,318,116  |  |  60,829,605  |   |
|                                                                                                                                                                                |  |  |  |  |   |
|    Net income (loss) per common share                                                                                                                                | $ | (0.02)  |   $ | (0.02)  |   |
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| No computation of diluted loss per common share is included  for either periodbecause such   computation results in an antidilutive  loss per commonshare. |   |