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Light sensing circuit

A light sensing and circuit technology, which can be used in measuring circuits, using electrical radiation detectors for photometry, etc., and can solve problems such as voltage and potential drop.

Inactive Publication Date: 2015-04-15
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relationship of the leakage current Id, the voltage potential of the terminal Va according to the degree of light received by the phototransistor 910 produces different leakage currents Id, which in turn causes the voltage potential of the terminal Va of the capacitor 20 to drop.

Method used

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Embodiment Construction

[0048] The terms (terms) used throughout the specification and claims, unless otherwise specified, usually have the usual meaning of each term used in this field. The terms "substantially", "around", "about" or "approximately" as used herein shall generally mean within 20% of a given value or range, Preferably within 10%. In addition, if the term "electrical (sexual) coupling" or "electrical (sexual) connection" is used herein, it includes direct and indirect electrical connection means. Similarly, if the word "couple" or "connection" is used herein, it includes direct and indirect connection or coupling means.

[0049] In addition, in the entire description and the scope of the patent application, if there is a description similar to "the description that affects the result B according to the parameter A", unless otherwise specified, the parameter A can be only multiple parameters that affect the result B. One or parameter A may be the only parameter affecting outcome B. T...

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PUM

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Abstract

A light sensing circuit comprises a capacitor, a bigrid optotransistor, a reading transistor, and a control circuit, wherein the bigrid optotransistor comprises a first end, a second end, a first grid electrode, and a second grid electrode; the first end of the bigrid optotransistor is electrically connected with the capacitor; the reading transistor is electrically coupled with the capacitor and configured to supply an output signal to a reading line according to the voltage potential stored by the capacitor; and the control circuit is configured to control the voltage potential of the second grid electrode of the bigrid optotransistor according to the intensity of light irradiated on the control circuit.

Description

【Technical field】 [0001] The invention relates to a light sensing circuit, in particular to a phototransistor of the light sensing circuit and its control circuit. 【Background technique】 [0002] figure 1 It is a schematic diagram of a known photo-sensing circuit, wherein the photo-sensing circuit 100 includes a phototransistor 910 , a capacitor 20 , a readout transistor 30 and a readout line 40 . A first terminal of the phototransistor 910 is electrically coupled to the capacitor 20 , and a gate terminal of the phototransistor 910 is configured to receive a first control signal G(n+1), thereby controlling the phototransistor 910 to be turned on or off. The second end of the phototransistor 910 receives the second control signal S(n), and one end of the readout transistor 30 is electrically coupled to the capacitor 20 , and the other end is electrically coupled to the readout line 40 . [0003] figure 2 it's for figure 1 It is a waveform diagram of the operation of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/46
Inventor 萧亚缇沈柏元吴育华
Owner AU OPTRONICS CORP