[1] [1] Ma Y, She P F, Zhang K Y, et al. Dynamic metal-ligand coordination for multicolour and water-jet rewritable paper[J]. Nature Communications, 2018, 9: 8.

[2] [2] Overton, Gail. Kindles and cuttlefish: Biomimetics informs e-paper displays[J]. Laser Focus World, 2012(12): 16-20.

[3] [3] He T, Jin M L, Eijkel J C T, et al. Two-phase microfluidics in electrowetting displays and its effect on optical performance[J]. Biomicrofluidics, 2016, 10(1): 12.

[4] [4] Cheng W Y, Lo K L, Chang Y P, et al. 37.1: Novel development of large-sized electrowetting display[J]. SID Symposium Digest of Technical Papers, 2008, 39(1): 526-529.

[5] [5] Luo Z J, Zhang W N, Liu L W, et al. Portable multi-gray scale video playing scheme for high-performance electrowetting displays[J]. J. of the Society for Information Display, 2016, 24(6): 345-354.

[6] [6] Chiang H C, Tsai Y H, Yan Y J, et al. Oil defect detection of electrowetting display[C]// Optical Manufacturing and Testing Ⅺ., 2015.

[7] [7] Zhang X M, Bai P F, Hayes R, et al. Novel driving methods for manipulating oil motion in electrofluidic display pixels[J]. J. of Display Technol., 2016, 12(2): 200-205.

[8] [8] Zhang H, Liang X L. Bistable electrowetting device with non-planar designed controlling electrodes for display applications[J]. Frontiers of Information Technology and Electronic Engin., 2019, 20(9): 1289-1295.

[9] [9] Xing J W, Yang P, Qingge L. Automatic thresholding using a modified valley emphasis[J]. IET Image Processing, 2020, 14(3): 536-544.

[10] [10] Otsu N. A threshold selection method from gray-level histograms[J]. IEEE Trans. on Systems Man and Cybernetics, 1979(1): 62-66.