| CPC H04N 23/55 (2023.01) [G02B 3/14 (2013.01); G02B 7/04 (2013.01); H02M 3/157 (2013.01)] | 17 Claims |
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1. A camera module, comprising:
a liquid lens; a voltage control circuit; and a switching unit;
wherein the liquid lens comprises:
a first plate comprising a cavity in which a conductive liquid and a non-conductive liquid are disposed;
a second plate disposed above the first plate; and
a third plate disposed below the first plate,
wherein a common electrode is disposed on one side of the first plate,
wherein a plurality of individual electrodes are disposed on an opposite side of the first plate,
wherein the voltage control circuit comprises:
a first voltage generator configured to output a first voltage; and
a DC bias terminal disposed between an output terminal of the first voltage generator and a ground voltage,
wherein the switching unit comprises:
a plurality of first switches configured to transmit one selected from the first voltage and the ground voltage to the plurality of individual electrodes; and
a second switch configured to transmit one selected from the first voltage and the ground voltage to the common electrode,
wherein the first voltage is applied to the plurality of individual electrodes or the common electrode during a first predetermined period of time,
wherein after application of the first voltage, a second voltage that is lower than the first voltage and is higher than the ground voltage is applied to the plurality of individual electrodes or the common electrode during a second predetermined period of time, and
wherein a level of the first voltage is decreased to a level of the second voltage by the DC bias terminal,
wherein a sum of the first voltage and the second voltage is 70 V, and
wherein a ratio of the first voltage to the second voltage corresponds to a resistance of a resistor included in the DC bias terminal.
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