Via ajax request not showing barcode

[khudadadrs]

When I want to get barcode using ajax request it's not showing the image but displaying unclear codes like : �PNG IHDRB>�Z pHYs���+�IDATh��A �0���9;̖n��8�A:ۤ��=9z��7�Z�G�V��� S[�=8d0o΂}j_��A�F�AB j�P��$� � 5H�AB j�P��$� � 5H�AB j�P��$� � 5H,���ow�Ywun ��M��T5U�9;�ET���^]��f��?��Y�[8��c�񹺷^m6&��l�Y�Kry/_�IEND�B� `