P‐75: Large‐Area Optical Fingerprint for OLED based on LTPS Technology

Wu, Xiaoxiao; Chen, Binbin; Li, Zuoyin; Wu, Jing; Chen, Yingping; Bai, Meiyan; Liu, Bingping; Chen, Guozhao; Li, Junyi

doi:10.1002/sdtp.14957

Cited by 3 publications

(4 citation statements)

References 2 publications

(3 reference statements)

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“…Additionally, the researchers created optical fingerprint recognition [ 118 ] that can be integrated into LTPS image display technology beneath the OLED display and can cover the entire display’s dimensions. OLED uses its own self-illuminating light as its light source and employs micro-collimators to prevent overlapping light signals.…”

Section: Optical Fingerprint Recognitionmentioning

confidence: 99%

“…( f ) Field of view diagram of the micro-lens array, ( g ) a collimating optical path based on microlens array, ( h ) the fingerprint image captured by it [ 117 ], ( i ) Stack structure of the fingerprint under OLED, and ( j ) diagram of a collimating system on the photo sensor. ( k ) Influence of collimating system on SNR [ 118 ], and ( l ) fingerprint on display (FoD Module). Assembly stack of the FoD module, ( m ) construction of organic image sensor, ( n ) the fingerprint capture by it [ 119 ], ( o ) structure of fingerprint sensor, and ( p ) the fingerprint capture by it [ 120 ].…”

Section: Figurementioning

confidence: 99%

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A Review of Fingerprint Sensors: Mechanism, Characteristics, and Applications

Niu

et al. 2023

Micromachines

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Identification technology based on biometrics is a branch of research that employs the unique individual traits of humans to authenticate identity, which is the most secure method of identification based on its exceptional high dependability and stability of human biometrics. Common biometric identifiers include fingerprints, irises, and facial sounds, among others. In the realm of biometric recognition, fingerprint recognition has gained success with its convenient operation and fast identif ication speed. Different fingerprint collecting techniques, which supply fingerprint information for fingerprint identification systems, have attracted a significant deal of interest in authentication technology regarding fingerprint identification systems. This work presents several fingerprint acquisition techniques, such as optical capacitive and ultrasonic, and analyzes acquisition types and structures. In addition, the pros and drawbacks of various sensor types, as well as the limits and benefits of optical, capacitive, and ultrasonic kinds, are discussed. It is the necessary stage for the application of the Internet of Things (IoT).

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Section: Optical Fingerprint Recognitionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

A Review of Fingerprint Sensors: Mechanism, Characteristics, and Applications

Niu

et al. 2023

Micromachines

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“…In order to increase the area of fingerprint recognition zone, sensors such as OPD [1][2][3] and PIN [4] that can be manufactured on glass substrates have been proposed. However, due to their complex process flow and the need for expensive optical structures such as collimators or microlenses [5][6][7][8], they have not yet been mass-produced.…”

Section: Introductionmentioning

confidence: 99%

P‐29: A bias TFT with high photosensitive current for optical sensors

Xu,

Yao,

Zhang

et al. 2024

Symp Digest of Tech Papers

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A photosensitive TFT sensor called bias TFT fabricated using simple amorphous silicon process in this paper. The photosensitive current of bias TFT is linearly related to the brightness of the top light source and inversely proportional to the size of the bias region. The photosensitivity current can be up to 10E‐8 amperes under 100 nits illumination. Among four shapes of bias TFTs, L‐type TFTs have the highest photo current.

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“…One of the immense challenges in large-area optical fingerprint recognition for OLED displays is the cost of the detection circuit. There are three common thin-film transistor technologies on the market, i.e., amorphous silicon (a:Si) [4], indium gallium zinc oxide (IGZO) [5], and low-temperature polysilicon (LTPS) [6]. As the first technology developed, a:Si TFT products have a lower reliability, aperture ratio, and PPI.…”

Section: Introductionmentioning

confidence: 99%

The Design and Fabrication of Large-Area Under-Screen Fingerprint Sensors with Optimized Aperture and Microlens Structures

Yeh,

Huang,

Lin

et al. 2023

Sensors

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In this paper, we designed and fabricated an optical filter structure applied to the FoD (Fingerprint on Display) technology of the smartphone, which contains the microlens array, black matrix, and photodetector to recognize the fingerprint on a full touchscreen. First, we used optical ray tracing software, ZEMAX, to simulate a smartphone with FoD and a touching finger. We then further discussed how the aperture and microlens influence the fingerprint image in this design. Through numerical analysis and process constraint adjustment to optimize the structural design, we determined that a modulation transfer function (MTF) of 60.8% can be obtained when the thickness of the black matrix is 4 μm, allowing successful manufacturing using photolithography process technology. Finally, we used this filter element to take fingerprint images. After image processing, a clearly visible fingerprint pattern was successfully captured.

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P‐75: Large‐Area Optical Fingerprint for OLED based on LTPS Technology

Cited by 3 publications

References 2 publications

A Review of Fingerprint Sensors: Mechanism, Characteristics, and Applications

A Review of Fingerprint Sensors: Mechanism, Characteristics, and Applications

P‐29: A bias TFT with high photosensitive current for optical sensors

The Design and Fabrication of Large-Area Under-Screen Fingerprint Sensors with Optimized Aperture and Microlens Structures

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