A method stores data and check bits for that data within a memory chip. The electro-oculography apparatus 100 also includes a maximum filtering unit 122 or a minimum filtering unit 124 each outputting a second eye potential signal by applying the other of the maximum value filtering and the minimum value filtering to the first eye potential signal. A thermometer code data word may be used as a control signal for the circuitry. Employment of this structure can provide the circularly polarizing plate having good view angle characteristics and a vertical alignment type of liquid crystal display panel having the same.