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DLPLCR4500EVM: Wrong pattern sequence display

Part Number: DLPLCR4500EVM
Other Parts Discussed in Thread: DLPC350, DLP4500


I'm using the Pattern Sequence Mode of DLPLC4500EVM to display 6bits pictures through HDMI. The picture I used was originally written as 24 bits, so I can also see it on Video Mode which is quite normal.
But when I switch to Pattern Sequence Mode, the result is very confused. The picture is only on the top of the screen (which is compressed vertically and extended horizontally), and at the bottom of the screen is part of the first picture when switching (which do not change in any condition). Have anyone met the same or similar problems?
I use white, 6 bits, 1280x800 resolution. The period and exposure times both are 2500us.
Any suggestions are welcomed!