All the white on blue 1602 or 128x64 LCD displays I've purchased from Ebay have a draw/refresh rate about 3 times (or more) slower than the black on green LCDs with the same resolution and controller chip and similar price ($6-$20). Any kind of animation, or characters that change more than twice per second just appear as a blur in the transition from blue to white and back again.
Is this just my bad luck, or is there something inherently slow with the white on blue type of display?
Finding refresh specs for these 'no name' displays is near impossible because there are so many variations.
Mike