Optical Properties of Hydrogenated Amorphous Silicon Thin-Film Transistor-Based Optical Pixel Sensor in Three Primary Colors

Lin, Chih‐Lung; Chen, Wu; Chiu, Wen-Ching; Wu, Wan-Lin; Yu, Jian‐Shen

doi:10.1109/jstqe.2017.2701554

Cited by 10 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transfer I-V characteristics of photo sensor at 532 nm illumination for a bias voltage Vds = 15 V capacitor can be further transferred to an external charge amplifier, and the position of the sensor that receives the optical input signal will thus be identified. [4] Fig. 2 shows the representative transfer characteristics of photo-TFT.…”

Section: Photo Sensormentioning

confidence: 99%

P‐16.1: A full integration of photo sensor and capacitive touch sensor on flat panel display

Zha¹,

Lu²,

Gao³

et al. 2021

Symp Digest of Tech Papers

View full text Add to dashboard Cite

Section: Photo Sensormentioning

confidence: 99%

P‐16.1: A full integration of photo sensor and capacitive touch sensor on flat panel display

Zha¹,

Lu²,

Gao³

et al. 2021

Symp Digest of Tech Papers

View full text Add to dashboard Cite

“…However, the intensity of ambient light would also affect the output of photo sensor and leading to a low signal-to-noise ratio (SNR) [5]. Hence, recent studies proposed a new photo sensor circuit by Lin et al [6,7,8] by combining a-Si:H TFTs and R, G, B color filters to against ambient illumination. In this work, the proposed sensor circuit is integrated in the display area of a 15-inch XGA TFT-LCD as a sensor matrix of 113(×3)×256 to verify the feasibility of in-cell optical touch function.…”

Section: Objective and Backgroundmentioning

confidence: 99%

44‐1: Photo Sensors Embedded within TFT‐LCD with Three Primary Colors Optical Touch Function

Kuo

Hung

Liao

et al. 2019

Symp Digest of Tech Papers

Self Cite

View full text Add to dashboard Cite

In this paper, a 15-inch XGA TFT-LCD with embedded 113×256 three primary colors photo sensors is successfully developed by a-Si:H TFT. Each photo sensor consists of one TFT switch, one storage capacitor and diode-connected TFTs covered with color filters of three primary colors (red, green, and blue). The diodeconnected TFTs include a recently proposed white-light photocurrent gating (WPCG) sub-circuit to suppress the effects of ambient light illumination.

show abstract

“…The peak wavelength of the blue LED that is used in this work is 470 nm. The optical transmission rates of color filters under illumination by the light with various wavelengths was investigated in our previous work [16]. Fig.…”

Section: Device Characteristicsmentioning

confidence: 99%

Long-Term Behavior of Hydrogenated Amorphous Silicon Thin-Film Transistors Covered With Color Filters for Use in Optical Sensors

et al. 2019

Self Cite

View full text Add to dashboard Cite

This work investigates the long-term behavior of photo thin-film transistors (TFTs) that are covered with color filters and based on hydrogenated amorphous silicon (a-Si:H) technology. Based on the electrical characteristics and the optical responses of these TFTs as measured under different stress conditions, a new method for driving a photo TFT with a negative gate-source voltage is proposed to suppress the degradation of the photocurrent. The effectiveness of the newly proposed method is verified using our previously developed white-light photocurrent gating (WPCG) structure, the measurement of photocurrents, and the established models of red, green, and blue photo TFTs. An accelerated lifetime test of the fabricated circuit was carried out at 70 • C and under the illumination of ambient light for 504 hours, demonstrating that the proposed method improves the long-term reliability of optical sensors.INDEX TERMS Hydrogenated amorphous silicon thin-film transistor, long-term reliability, optical sensor.

show abstract

Optical Properties of Hydrogenated Amorphous Silicon Thin-Film Transistor-Based Optical Pixel Sensor in Three Primary Colors

Cited by 10 publications

References 22 publications

P‐16.1: A full integration of photo sensor and capacitive touch sensor on flat panel display

P‐16.1: A full integration of photo sensor and capacitive touch sensor on flat panel display

44‐1: Photo Sensors Embedded within TFT‐LCD with Three Primary Colors Optical Touch Function

Long-Term Behavior of Hydrogenated Amorphous Silicon Thin-Film Transistors Covered With Color Filters for Use in Optical Sensors

Contact Info

Product

Resources

About