The invention addresses or overcomes poor visibility of an organic electroluminescence
display device in a bright place, and also addresses or overcomes an increase in
power consumption caused by an attempt to increase the luminance for the purpose
of enhancing visibility. In accordance with TFTs, the amount of light emission
of an organic electroluminescence display element is controlled in a dark place,
and the amount of light transmission of a liquid crystal display element is controlled
in a bright place. A static RAM is provided in each sub-pixel by an area ratio
gray-scale method. Low-temperature polycrystalline silicon TFTs are used for the
TFTs, luminescent polymer is used for the organic electroluminescence display element,
and super twisted nematic liquid crystal is used for a reflective liquid crystal
display element.
