Exhibit 31.1

TVIA, INC.

Certification of the Chief Executive Officer Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002 for the Period Ended March 31, 2004

I, Eli Porat, certify that:



1. I have reviewed this annual report on Form 10-K
of Tvia, Inc.;




2. Based on my knowledge, this report does not
contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to the period covered by this annual report;




3. Based on my knowledge, the financial statements,
and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in this annual report;




4. The registrants other certifying officer
and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
for the registrant and have:




a) Designed such disclosure
controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the
period in which this annual report is being prepared;




b) Evaluated the effectiveness of
the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this report based on such evaluation; and




c) Disclosed in this report any
change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter (the
registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect,
the registrants internal control over financial reporting; and




5. The registrants other certifying officer
and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the equivalent functions):




a) All significant deficiencies
and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the
registrants ability to record, process, summarize and report financial information; and


|b) |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants internal control over financial reporting.
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Date: June 21, 2004


|By: |  | /s/ Eli
Porat Eli Porat
Chief Executive Officer and President (Principal Executive Officer)
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