| 摘要 |
<p>PURPOSE:To discriminate obviously conditions of the current temperature for a set temperature, by providing a display material, which emits the light when the room temperature is higher than the set temperature, and a display material which emits the light when it is lower than the set temperature. CONSTITUTION:In case of a low room temperature, the potential at a point (a) determined by a temperature detecting thermistor 6, a temperature regulator 2, and a resistance 7 and potentials at points (b), (c), and (d) determined by resistances 8-11 satisfy relations (a)>(b), (c), and (d), and a light emitting diode 3 does not emit the light because the output of a voltage comparator 12 is 1, and a light emitting diode 4 emits the light because the output of a voltage comparator 13 is 0. When the room temperature approximates to the set temperature, respective potentials satisfy (a)>(b), (c), and (d), and outputs of voltage comparators 12 and 13 are 1, and light emitting diodes 3 and 4 do not emit the light. When the room temperature rises furthermore, the light emitting diode 3 emits the light because the output of the voltage comparator 12 is 0, and the light emitting diode 4 does not emit the light because the output of the voltage comparator 14 is 1.</p> |
