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AssigneeSeiko Epson Corporation
InventorMasahiko Tsuchiya
Estimating the term…
A temperature sensor circuit which includes: an adjustment circuit which generates a first divided voltage obtained by dividing a reference voltage; a current generation circuit which has a transistor element and generates a current corresponding to a gate voltage of the transistor element, the first divided voltage being supplied to a gate terminal of the transistor element; a voltage generation circuit which includes a diode element to which the current is supplied, an analog voltage being generated between both ends of the diode element; and an analog/digital (A/D) conversion circuit which compares a second divided voltage obtained by dividing the reference voltage with the analog voltage and converts the analog voltage into a digital value.
A temperature sensor circuit comprising:
A semiconductor integrated circuit comprising:
A method of adjusting a temperature sensor circuit, comprising:
A method of adjusting a temperature sensor circuit, comprising:
A temperature sensor circuit comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using…: using…
Thermometers with dedicated analog to digital converters
Measuring temperature
Term ended 6 Aug 2023 (estimated)
Japanese Patent Application No. 2002-247300 filed on Aug. 27, 2002, is hereby incorporated by reference in its entirety.
The present invention relates to a temperature sensor circuit, a semiconductor integrated circuit including the temperature sensor circuit, and a method of adjusting the temperature sensor circuit.
A display control circuit for a display device using an electro-optical element must control the display taking temperature dependence of the electro-optical element into consideration. In the case where a liquid crystal is used as the electro-optical element, transmittance of the liquid crystal differs depending on the ambient temperature even at the same applied voltage. Therefore, the display control circuit must apply a voltage corresponding to the ambient temperature to the electro-optical element by performing temperature compensation.
FIG. 1 is a schematic block diagram showing configuration of a semiconductor integrated circuit including a temperature sensor circuit according to one embodiment of the present invention.
FIG. 2 is a schematic diagram of a temperature sensor circuit.
FIG. 3 is a schematic diagram of a fuse circuit.
Embodiments of the present invention are described below. Note that the embodiments described below do not in any way limit the scope of the invention laid out in the claims herein. In addition, all elements of the embodiments described below should not be taken as essential requirements of the present invention.
There may be a case where a temperature sensor circuit is provided to a display control circuit in order to apply a voltage corresponding to the ambient temperature to an electro-optical element. In this case, the temperature sensor circuit provides sensor outputs obtained at a reference ambient temperature and an ambient temperature during use, and these sensor outputs are relatively evaluated to specify the ambient temperature during use. A voltage corresponding to the specified ambient temperature is then applied to an electronic element.
However, since the temperature sensor circuits have process margins and their outputs depend on chips even under the same ambient temperature, the temperature cannot be precisely compensated corresponding to the ambient temperature.