Exhibit 15.1

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Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-137585 and No. 333-176863) on Form S-8 of our reports dated March 27, 2026, with respect to the consolidated financial statements of Himax Technologies, Inc. and subsidiaries and the effectiveness of internal control over financial reporting.

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/s/ KPMG

Hsinchu, Taiwan

March 27, 2026