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def _prepare_display(self):

    (fig, axis) = plt.subplots(figsize=(4, 6))
    fig.set_size_inches(4, 6)
    fig.canvas.mpl_connect('close_event', exit)
    plt.axis((0, self.screen_width, 0, self.screen_height))
    plt.tick_params(top='off', right='off', left='off', labelleft='off', bottom='off', labelbottom='off')
    plt.draw()
    plt.ion()
    plt.show()
    return (fig, axis)
