**EXHIBIT  11**

**SI DIAMOND TECHNOLOGY, INC.**

**COMPUTATION OF (LOSS) PER COMMON SHARE**

|                                                                                                                  |        | Three months endedDecember 31, |        | Year endedDecember 31, |
|-----------------------------------------------------------------------------------------------------------------------|--------|--------------------------------|--------|------------------------|
|                                                                                                                  |        |                                |        |                        |
|                                                                                                                  |        | 2002                           |        | 2001                   |  | 2002 |  | 2001 |
|                                                                                                                  |        |                                |        |                        |  |  |  |  |
|                                                                                                                  |   |                           |   |                   |   |   |   |   |
| Computation of income ( loss ) per common share:                                                                      |   |                           |   |                   |    |   |   |
|                                                                                                                  |   |                           |   |                   |   |   |   |
|    Net income (loss) applicable to common         shareholders |        | $(600,597)                     |   | $(1,263,610)           |   | $(4,946,351) |  | $(5,166,559) |
|                                                                                                                  |   |                           |   |                   |   |   |   |   |
|    Weighted average number of common shares                                                                 |   | 75,984,625                |   | 66,859,367        |   | 71,829,575  |   | 64,716,156  |
|                                                                                                                  |   |                           |   |                        |   |   |   |   |
|    Net income (loss) per common share                                                                       |   | $(0.01)                        |   | $(0.02)                |   | $(0.07) |   | $(0.08) |
|                                                                                                                  |   |                           |   |                   |   |   |   |   |
|                                                                                                                  |   |                           |   |                   |   |   |   |   |
|                                                                                                                  |   |                           |   |                   |   |   |   |   |

No computation of diluted loss per common share is included for the any periods becausesuch computation results in an antidilutive loss per common share.