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Toys with a LCD
Animated LCD

  Well, the image flip animation* does not quite illustrate the refresh rate of an animated LCD correctly.
  I think it still gives the idea of how the matrix turns on a single pixel at a time so fast that your eye thinks all of the pixels are on.

lcd simulation slow lcd simulation fast
Happy FaceSlow simulated refreshFast simulated refresh

  For my animation I used a matrix of 10 rows by 10 columns. If we assign letters a-j to the rows and numbers 1-10 for the columns we can see to get the first row (top of head) top "turn on" there would be signals on a+4, a+5, a+6, a+7. Then it would proceed down the other rows - b+4, b+8, c+2, c+9, d+1, and so on (just a side note that I might be the only one to notice the eyes and mouth are 1/2 pixel off on the columns). This is backwards of how a matrix keypad works where pressing the single button sends singals to two pins.
  Now this is an over simplified idea of an LCD matrix and a single simple stationary image. If the head was bouncing there would be an offset for each position from the previous position. Depending on the mode of play the head could be zooming in and out (appearing larger and smaller) or there could be letters on the screen as well. The more happening/going on on the screen the more complex the signals being output from the cpu/mcu.

*Due to the number of images (32) if you have a slow connection speed or slow computer this animation might look really horrible.

Overview
Animated LCD
Pitch control

cappy@sailormouth.org