1. A liquid crystal display (LCD) comprising:
a liquid crystal panel; and
a temperature-measurement apparatus which comprises:
a temperature sensor comprising a variable-resistance element associated with the liquid crystal panel, the variable-resistance element exhibiting a resistance that varies as a function of a temperature of the liquid crystal panel, and a fixed-resistance element connected in series with the variable-resistance element, the series connected variable-resistance element and the fixed-resistance element being coupled to a first input voltage and providing at a first output a first temperature-dependent variable voltage that is a function of a temperature of the liquid crystal panel;
a voltage divider circuit coupled to a second input voltage, the voltage divider circuit providing at a second output a reference voltage; and
a differential amplifier having first and second inputs coupled respectively to the first and second outputs, the differential amplifier providing at an output a second temperature-dependent variable voltage which is a function of voltages received at the first and second inputs.
2. The LCD of claim 1, wherein a resistance of the variable-resistance element increases as a temperature of the liquid crystal panel increases, and decreases as a temperature of the liquid crystal panel decreases.
3. The LCD of claim 1, wherein the temperature sensor further comprises a buffer coupled to receive at an input the first temperature-dependent variable voltage and provide to the differential amplifier from an output the first temperature-dependent variable voltage unchanged.
4. The LCD of claim 1, wherein the liquid crystal panel is divided into a display area and a non-display area, and the variable-resistance element is formed in the non-display area.
5. The LCD of claim 1, wherein the differential amplifier increases a range of variation of the first temperature-dependent variable voltage according to the temperature of the liquid crystal panel and outputs the second temperature-dependent variable voltage.
6. The LCD of claim 1, further comprising a calibrator which calibrates the second temperature-dependent variable voltage and outputs temperature information,
wherein the calibrator calibrates the second temperature-dependent variable voltage to a target voltage on a target temperature-voltage graph, and outputs temperature information regarding the target voltage on the target temperature-voltage graph, the target temperature-voltage graph indicating a target voltage corresponding to the temperature of the liquid crystal panel.
7. The LCD of claim 6, further comprising a memory coupled to the calibrator, the memory being adapted to store calibration data for calibrating the second temperature-dependent variable voltage to the target voltage on the target temperature-voltage graph, and provides the calibrator with the calibration data.
8. The LCD of claim 1, wherein the variable-resistance element comprises a conductive material.
9. An LCD comprising:
a liquid crystal panel;
one or more temperature-measurement apparatuses associated with the liquid crystal panel, the one or more temperature-measurement apparatuses being operative to output one or more temperature-dependent voltages having a magnitude which is a function of a temperature of the liquid crystal panel; and
a calibration circuit operative to calibrate the one or more temperature dependent voltages and output temperature information,
wherein the calibration circuit is operative to calibrate the first temperature-dependent variable voltage to be a target voltage on a target temperature-voltage graph, and outputs temperature information regarding the target voltage on the target temperature-voltage graph, the target temperature-voltage graph indicating a target voltage corresponding to the temperature of the liquid crystal panel.
10. The LCD of claim 9, wherein the calibrator converts the first temperature-dependent variable voltage into digital temperature-dependent variable data, performs a logic operation on the digital temperature-dependent variable data using previously stored calibration data, and outputs the temperature information.
11. The LCD of claim 10, further comprising a memory coupled to the calibrator, the memory being adapted to store and provide the calibrator with the calibration data.
12. The LCD of claim 10, wherein the calibrator calculates an average of a plurality of first temperature-dependent variable voltages output by the temperature-measurement apparatuses, calibrates the average of the plurality of first temperature-dependent variable voltages, and outputs the temperature information.
13. The LCD of claim 9, wherein each of the temperature-measurement apparatuses comprise a variable-resistance element having a resistance that varies according to the temperature of the liquid crystal panel and a fixed-resistance element connected in series to the variable-resistance element, divides an input voltage and outputs the first temperature-dependent variable voltage.
14. The LCD of claim 9, wherein each of the temperature-measurement apparatuses comprises:
a temperature sensor comprising a variable-resistance element having a resistance that varies according to the temperature of the liquid crystal panel and a fixed-resistance element connected in series to the variable-resistance element, divides a first input voltage, and outputs a second temperature-dependent variable voltage that varies according to a temperature of the liquid crystal panel;
a voltage divider dividing a second input voltage, and outputting a reference voltage; and
a differential amplifier amplifying a difference between the second temperature-dependent variable voltage and the reference voltage, and outputting the first temperature-dependent variable voltage.
15. The LCD of claim 14, wherein each of the temperature-measurement apparatuses further comprises a buffer which provides the differential amplifier with the unchanged second temperature-dependent variable voltage.
16. The LCD of claim 13, wherein the variable-resistance element comprises a conductive material, and the resistance of the variable-resistance element increases as the temperature of the liquid crystal panel increases, and decreases as the temperature of the liquid crystal panel decreases.
17. The LCD of claim 13, wherein the liquid crystal panel is divided into a display area and a non-display area, and the variable-resistance element is formed in the non-display area.
18. The LCD of claim 14, wherein the variable-resistance element comprises a conductive material, and the resistance of the variable-resistance element increases as the temperature of the liquid crystal panel increases, and decreases as the temperature of the liquid crystal panel decreases.
19. The LCD of claim 14, wherein the liquid crystal panel is divided into a display area and a non-display area, and the variable-resistance element is formed in the non-display area.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An injection molded thermally conductive plastic substrate for supporting electronic circuits, comprising:
about 20% to about 80% by weight of a thermoplastic matrix; and
about 20% to about 80% by weight of a thermally-conductive, electrically-insulating material,
wherein said substrate has a dielectric strength of greater than 40,000 volts.
2. The substrate of claim 1, wherein the substrate has a thermal conductivity of greater than 3 Wm\xb0 K.
3. The substrate of claim 1, wherein the composition comprises about 30 weight % polyphenylene sulfide, about 60 weight % boron nitride particles, and about 10 weight % reinforcing chopped glass.