Image sensing device

An image sensing and light sensing technology, applied in image communication, TV, color TV components and other directions, can solve problems such as unfavorable signal analysis, voltage value is too small, output signal exceeds dynamic range, etc., to avoid signal value oversized effect

Pending Publication Date: 2021-04-30
EGIS TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Although increasing the capacitance of the capacitive element in the post-stage circuit can solve the problem that the output signal exceeds the acceptable dynamic range, when the sensing pixel is in a low-illuminance environment, the output voltage value of the post-stage circuit will be too high. Small problems that are not conducive to signal analysis

Method used

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Examples

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Embodiment Construction

[0015] figure 1 is a schematic diagram of an image sensing device according to an embodiment of the present invention, please refer to figure 1 . The image sensing device may include a light sensing unit 102, an amplifying circuit 104, an analog to digital conversion circuit (Analog to Digital Converter, ADC) 106, an input adjustment circuit 108, and a control circuit 110. The amplifying circuit 104 is coupled to the light sensing unit 102, the analog The digital conversion circuit 106 and the input adjustment circuit 108 , the control circuit 110 is coupled to the analog-to-digital conversion circuit 106 and the input adjustment circuit 108 . In one embodiment, the image sensing device may be, for example, a fingerprint sensor or an X-ray flat panel sensor, but is not limited thereto. Further, the amplifying circuit 104 includes an operational amplifier A1 and a capacitor C1. The negative input terminal of the operational amplifier A1 is coupled to the light sensing unit 10...

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Abstract

The invention provides an image sensing device. A control circuit determines the voltage change rate of the sensing signal according to the voltage value of the sensing signal generated by the light sensing unit in the estimation period, and controls the input adjusting circuit to provide the input adjusting signal to the negative input end of the operational amplifier in the exposure period according to the voltage change rate. Therefore, the signal value of the amplification signal falls within the preset range during the exposure period.

Description

technical field [0001] The invention relates to a sensing device, in particular to an image sensing device. Background technique [0002] A common image sensing device may include a sensing pixel array composed of a plurality of sensing pixels, each sensing pixel converts incident light into a sensing signal, and by analyzing the sensing signal provided by each sensing pixel, the The image sensed by the image sensing device. Further, each sensing pixel may include a photodiode, which converts light into an electrical signal. The continuous exposure of the photodiode will cause the voltage value of the sensing signal output by the sensing pixel to continuously decrease. The image sensed by the image sensing device can be obtained by providing the voltage value of the sensing signal. [0003] Generally speaking, in order to improve the sensitivity of the image sensing device, the size of the sensing pixel is increased as much as possible to increase the charge generated by t...

Claims

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Application Information

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IPC IPC(8): H04N5/355
CPCH04N25/59H04N25/78H03F3/087H03M1/52H04N25/57H03F3/45475
Inventor 林郁轩彭子洋王仲益洪自立
Owner EGIS TECH
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