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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper presents a primary color optical pixel sensor circuit that utilizes hydrogenated amorphous silicon thin-film transistors (TFTs). To minimize the effect of ambient light on the sensing result of optical sensor circuit, the proposed sensor circuit combines photo TFTs with color filters to sense a primary color optical input signal. A readout circuit, which also uses thin-film transistors, is integrated into the sensor circuit for sampling the stored charges in the pixel sensor circuit. Measurements demonstrate that the signal-to-noise ratio of the proposed sensor circuit is unaffected by ambient light under illumination up to 12 000 lux by white LEDs. Thus, the proposed optical pixel sensor circuit is suitable for receiving primary color optical input signals in large TFT-LCD panels.

Original languageEnglish
Pages (from-to)2777-2785
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Volume51
Issue number11
DOIs
Publication statusPublished - 2016 Nov

Fingerprint

Thin film transistors
Amorphous silicon
Lighting
Pixels
Networks (circuits)
Sensors
Color
Optical sensors
Liquid crystal displays
Light emitting diodes
Signal to noise ratio
Sampling

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Lin, Chih Lung ; Wu, Chia En ; Chen, Po Syun ; Lai, Po Cheng ; Yu, Jian Shen ; Chang, Chun ; Tseng, Ya Hui. / Optical Pixel Sensor of Hydrogenated Amorphous Silicon Thin-Film Transistor Free of Variations in Ambient Illumination. In: IEEE Journal of Solid-State Circuits. 2016 ; Vol. 51, No. 11. pp. 2777-2785.
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Optical Pixel Sensor of Hydrogenated Amorphous Silicon Thin-Film Transistor Free of Variations in Ambient Illumination. / Lin, Chih Lung; Wu, Chia En; Chen, Po Syun; Lai, Po Cheng; Yu, Jian Shen; Chang, Chun; Tseng, Ya Hui.

In: IEEE Journal of Solid-State Circuits, Vol. 51, No. 11, 11.2016, p. 2777-2785.

Research output: Contribution to journalArticle

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