OID value: 1.3.6.1.5.5.7.20.2
OID description:
RFC3709 :
The certificate background logotype, if present, MUST contain a
graphical image intended as a background image for the certificate,
and/or a general audio sequence for the certificate. The background image MUST allow black text to be clearly read when placed on top of the background image. The logotype extension MUST NOT contain more than one certificate background logotype.
URL for further info: http://www.ietf.org/rfc/rfc3709.txt
See also the OID Repository website reference for 1.3.6.1.5.5.7.20.2