Abstract
We present 4-bit digital liquid lens for variable focal length using the binary control of four bit actuators (b 4 , b 3 , b 2 , and b 1 actuators). The input volume into the lens is precisely controlled in 24 levels depending on the binary control of the bit actuators such as digital actuation mode (b 4 b 3 b 2 b 1 ). Compared to previous analog liquid lens, it precisely control lens curvature and focal length. Experimentally, the maximum deflection range of the present lens is 0∼11.6µm and one step of maximum deflection, least significant bit (LSB), is 0.75µm±0.2µm. It also control focal length from 3.63 to 38.6mm in 16 levels.
Published Version
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