I was under the impression the the Hana scaler chip was to scale up the video image (720p, 1080p) etc...
I think it's a bad name that stuck. The video resolution (and thus scaling) is most likely handled by the GPU.
The HANA chip probably handles colour space and video/audio transport conversions. It's more of a video encoder, converting RGB to YCbCr and contains component DACs, composite DAC, VESA driver, HDMI driver, etc. Same deal with audio.