This paper presents an imaging method of a liquid crystal (LC) lens using a 90° twisted nematic LC (TNLC) cell instead of a polarizer. Two images are captured with the 90° TNLC cell in the 0° and 90° optical rotatory states. By overlapping the two images and subtracting the defocused image obtained when the LC lens is not working, we can reduce the introduction of undesired low-frequency components of non-modulated light. In this way, the contrast of the final image is enhanced, and the noise generated by the original imaging processing without a polarizer is lessened. The proposed method is verified by experiments, and the results show that clear and well-focused images can be obtained without any polarizer.