To my experience, no. The image fades away within a second or two. The TFT-s seem to store the data on their gate capacitance (the latter being just a guess based on the preceeding observation).
Many of the newer SVGA and up (and some smaller) use LVDS to serially transport the signals you already saw, designing in a buffer may be a good idea (many TFT modules have very short market life).
Neither do I. Those I used have had normal TTL voltage levels (upper limit being 3.3 V determined rather than 5, though). Perhaps this refers to some upper/lower display half or something.
DL means Data Lower Display, DU means Data Upper Display
The module clock data in with the principle of interlacing like a television. So data for line 1 is clocked in the same time as data for line 241 (for a 640 line display)
When you stop datatransfer the display is gone immedeately (glow time of 10-20ms)
See this datasheet for info on a common old-style display
Usually Data enable as well, indicating the active region of the display. a few panels use this as a combined h/vsync and ignore the other sync signals.
No, and the screen may be damaged by DC bias if left with power on and no clocks
Mostly, yes.
There are a lot of TFT datasheets (some only connection info) linked from here :
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