code: public void setLcdCrystalEnabled(final boolean ENABLED) {
          if (null == lcdCrystalEnabled) {
              _lcdCrystalEnabled = ENABLED;
              fireUpdateEvent(VISIBILITY_EVENT);
          } else {
              lcdCrystalEnabled.set(ENABLED);
          }
      }
docs: Defines if the crystal effect of the LCD display will be drawn.
  This feature could decrease the performance if you run it on
  embedded devices because it will calculate a bitmap image where
  each pixel will be calculated.
  @param ENABLED