Method for determining internal LCD temperature
First Claim
1. A method for accurately determining and controlling the temperature of liquid crystals in an electronic display comprising:
- providing an electronic display comprising a TFT array;
providing a metal heater layer integral to the TFT array of said electronic display;
determining the relationship between a resistance of the metal heater layer and a temperature of the metal heater layer;
initiating a temperature test interval;
turning on a heater layer voltage with a heater layer current;
measuring the heater layer voltage and heater layer current;
determining a heater layer resistance;
matching the heater layer resistance to a heater layer temperature via the relationship; and
comparing the heater layer temperature with a threshold temperature, if the heater layer temperature is above the threshold temperature, turning off the heater layer voltage and reinitiating the temperature test interval, and if the heater layer temperature is below the threshold temperature, reinitiating the temperature test interval.
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Abstract
Embodiments include a system and method for determining the temperature of the liquid crystal layer of a liquid crystal display. Because LCD performance is dependant on the temperature of the liquid crystal layer, performing particularly poorly in colder temperatures many LCD'"'"'s are available with integral heaters. Determining the temperature of the liquid crystal layer of an LCD is imperative for appropriate thermal management, which in turn leads to more-optimal LCD lifetime. Exemplary embodiments relate to accurately determining the temperature of the liquid crystal layer of an LCD by employing the integrated heater layer as a temperature sensor. When the relationship between the temperature of the integral heater is known, and the integral heater is disposed very near the liquid crystal layer, then determining the resistance of the metal heater layer, allows for rapid, accurate determination of the average temperature of the liquid crystal layer, and correspondingly better thermal management.
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Citations
18 Claims
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1. A method for accurately determining and controlling the temperature of liquid crystals in an electronic display comprising:
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providing an electronic display comprising a TFT array; providing a metal heater layer integral to the TFT array of said electronic display; determining the relationship between a resistance of the metal heater layer and a temperature of the metal heater layer; initiating a temperature test interval; turning on a heater layer voltage with a heater layer current; measuring the heater layer voltage and heater layer current; determining a heater layer resistance; matching the heater layer resistance to a heater layer temperature via the relationship; and comparing the heater layer temperature with a threshold temperature, if the heater layer temperature is above the threshold temperature, turning off the heater layer voltage and reinitiating the temperature test interval, and if the heater layer temperature is below the threshold temperature, reinitiating the temperature test interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for accurately determining and controlling the temperature of liquid crystals in an electronic display comprising:
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providing an electronic display comprising a TFT array; providing a metal heater layer integral to and contiguous with the TFT array of said electronic display; determining the relationship between a resistance of the metal heater layer and a temperature of the metal heater layer; measuring a resistance across the metal heater layer and using the known relationship between the temperature and the resistance of said metal heater layer to determine the temperature of the metal heater layer; allowing power to the metal heater layer to remain on so long as the temperature of the metal heater layer is below a threshold value; and turning off the power to the metal heater layer when the temperature of the metal heater layer rises above said threshold value.
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Specification