Optical Pixel Sensor of Hydrogenated Amorphous Silicon Thin-Film Transistor Free of Variations in Ambient Illumination. - Chih-Lung Lin; Chia-En Wu; Po-Syun Chen; Po-Cheng Lai; Jian-Shen Yu; Chun Chang; Ya-Hui Tseng (IEEE J. Solid State Circuits, 2016)