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Photoelectric sensor and photoelectric sensor array composed of the same

A photoelectric sensor and light-sensing technology, applied in instruments, character and pattern recognition, printing image acquisition, etc., can solve the problem that it is not suitable for integration at the bottom of the OLED screen

Pending Publication Date: 2018-02-16
MICROARRAY MICROELECTRONICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above two solutions are suitable for the situation where the optical fingerprint sensor is at the bottom of the glass cover, and neither is suitable for integration at the bottom of the OLED screen

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  • Photoelectric sensor and photoelectric sensor array composed of the same
  • Photoelectric sensor and photoelectric sensor array composed of the same
  • Photoelectric sensor and photoelectric sensor array composed of the same

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Embodiment Construction

[0036] Please refer to figure 1 The photoelectric sensor includes a photosensitive circuit array 10, and the photosensitive element array 10 is used to convert optical signals into electrical signals. In an optical fingerprint sensor, the photosensitive element array 10 converts optical signals into electrical signals to form a fingerprint image. The optical fingerprint sensor provided by the present invention includes a sensing pixel array 10, a bus 50, an integrating circuit 20 and a comparison circuit 30, the sensing pixel array 10 is composed of a plurality of photosensitive elements 16, and the output terminals of the plurality of photosensitive elements 16 are connected to The input end of the bus 50; the input end of the bus 50 is connected to the output end of a plurality of sensing pixels 16, and the output end is connected to the input end of the integration circuit 20; the input end of the integration circuit 20 is connected to the output end of the bus 50, and the o...

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Abstract

The invention relates to a photoelectric sensor provided with an L-Q-T signal detection circuit. During the optical signal detection process, the optical signal detection process is divided into the L-Q process and the Q-T process. During the L-Q process, namely a charge is transferred to an integrating capacitor, a light intensity signal is converted into a charge signal. During the Q-T process,an overturn signal is outputted through detecting the overturn of a comparison circuit, and then the charging time required for the integrating capacitor is determined. Finally, an obtained T is adopted as the output of the system. Compared with the prior art, the system output of the L-Q-T type signal detection circuit is more linear.

Description

technical field [0001] The invention relates to a photoelectric sensor and a photoelectric sensor array thereof, in particular to an "L-Q-T" type photoelectric sensor array. Background technique [0002] Fingerprint sensors are currently mainly divided into two categories, namely optical fingerprint sensors and capacitive fingerprint sensors. The capacitive fingerprint sensor images the fingerprint by measuring the difference in the connection capacitance formed between the fingerprint valley line, the ridge line and the planar sensing electrode array unit. When the dielectric layer between the sensing electrode array and the finger is thicker, the capacitance will attenuate, and the image of the sensor will be blurred. Due to the development of technology, the thickness of the dielectric layer between the sensing electrode and the target electrode of the commercial fingerprint sensor has increased from the order of 10um to the order of 100um. What's more, considering the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1318
Inventor 许科峰李扬渊
Owner MICROARRAY MICROELECTRONICS CORP LTD