| CPC G02B 3/14 (2013.01) [G03B 17/55 (2013.01)] | 10 Claims |
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1. A camera module comprising:
a lens assembly including a liquid lens;
a temperature sensor that detects a temperature of the liquid lens;
an image sensor that receives light passing through the lens assembly;
a detection unit that detects a first driving signal applied to the liquid lens to adjust an interface of the liquid lens; and
a determination unit that compares the temperature with a target temperature to provide a heating signal to a heater for adjusting the temperature of the liquid lens or to provide the temperature to a compensation unit,
wherein the compensation unit compensates the first driving signal with the temperature to generate a second driving signal for re-adjusting the interface of the liquid lens,
wherein the compensation unit includes:
a first input unit that receives the first driving signal;
a second input unit that receives the temperature;
a data unit that stores a plurality of third driving signals for each temperature with respect to a first diopter of the liquid lens and a plurality of fourth driving signals for each temperature with respect to a second diopter of the liquid lens;
a first calculation unit that calculates a third diopter of the liquid lens using the first driving signal; and
a second calculation unit that calculates the second driving signal corresponding to the temperature and the third diopter using at least one of the plurality of third driving signals and the plurality of fourth driving signals,
wherein the second calculation unit calculates a first driving function for the plurality of third driving signals and a second driving function for the plurality of fourth driving signals,
wherein the plurality of third driving signals are first digital codes at different temperatures for the first diopter, and the plurality of fourth driving signals are second digital codes at the different temperatures for the second diopter,
wherein the second calculation unit calculates a third driving function using driving signal values and diopters of the plurality of third driving signals and driving signal values and diopters of the plurality of fourth driving signals, and
wherein the second calculation unit calculates a plurality of fourth driving functions for each temperature from the first driving function and the second driving function and calculates the second driving signal using at least one of the first driving function, the second driving function, and the plurality of fourth driving functions.
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