This was posted under the LH7A400-10 also, here was the resposne:

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Steve,
The LH7A400's LCDENAB signal (labeled LCD_MDISP on the card engine) is a AC bias signal in STN mode. In STN mode, this signal will toggle on a set number of line clocks based on the value in the ACB field of the TIMING2 LCD control register. Check out the Sharp User Guide for the description of this value and for the signal. Typically, STN displays will have a signal called 'M' which this signal should be routed to if indeed the STN spec says it is a AC bias signal. (Typically there is a diagram showing this)

If the LCD has a 'DISP' signal, check if it is an "ON/OFF" signal or a AC bias signal. Typically it is a on/off signal. In this case, you could use the LCD_VDDEN signal, which is active high and turns on when the LCD controller comes up.

For proper use, you'll want to make sure to design to the LCD specs' power sequencing.

If you are struggling yet with this, I would suggest purchasing a support contract for our product service group to help with this. We have helped many customers interface to displays. Please contact the sales group if this is something you might like to do.

Thanks,
Mike A.