A clock using bright dot display comprises spaced illuminating display units arranged for the graduation marks of the clock, a micro processing unit which causes the illuminating display units of corresponding graduation marks to illuminate according to the time calculated by a time base unit. Each of the illuminating display units includes a first illuminating state, a second illuminating state and a third illuminating state. The illuminating display unit is the “hour indicator mark” in its first illuminating state, the “minute indicator mark” in its second illuminating state, and both the “hour indicator mark” and “minute indicator mark” in its third illuminating state. A user may easily read the time by observing the on and off states of the illumination of the “hour indicator mark” and “minute indicator mark” as well as the illumination colors of the illuminating display units.
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