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Light detection device and electronic equipment

A light detection device and a technology to be detected are applied in the direction of measurement devices, optical device exploration, circuits, etc., and can solve problems such as the brightness reduction of the display screen

Active Publication Date: 2019-06-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in digital cameras, control is performed such that the brightness of the display screen is automatically lowered when the user looks from the display screen to the viewfinder.

Method used

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  • Light detection device and electronic equipment
  • Light detection device and electronic equipment
  • Light detection device and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0059] For Embodiment 1 of the present invention, if using figure 1 and figure 2 The description is as follows.

[0060] figure 1 It is a block diagram showing the configuration of the photodetection device according to Embodiment 1 of the present invention.

[0061]

[0062] Such as figure 1 As shown, the photodetection device 101 includes a light-receiving amplifier circuit 2, a virtual amplifier circuit 3, a first high-pass filter circuit 4, a second high-pass filter circuit 5, a first differential amplifier circuit 7, a second differential amplifier circuit 8, a first A comparator circuit 9 , a second comparator circuit 10 , a signal processing circuit 11 , an output circuit 12 , a timing generating circuit 13 , an oscillation circuit 14 , a light emitting element driving circuit 15 and a light emitting element 16 .

[0063] The light-receiving amplifier circuit 2 has a light-receiving element 21 composed of a photodiode or the like, and an IV conversion circuit ...

Embodiment approach 2

[0102] For Embodiment 2 of the present invention, if according to image 3 and Figure 4 The description is as follows. In addition, for convenience of description, the same reference numerals are assigned to the constituent elements having the same functions as those described in Embodiment 1 above, and description thereof will be omitted.

[0103] In this embodiment, an example of the operation of the photodetection device 101 when the disturbance noise increases and when the disturbance noise decreases will be described.

[0104]

[0105] image 3 An example of the operation waveform of the aforementioned photodetection device 101 when the incident disturbance light increases is shown. in particular, image 3 and Figure 11 Similarly, it is also a waveform showing that the object 1 is present in the three periods of the measurement period (detection period), and that the disturbance light increases only in the second period.

[0106] Such as image 3 As shown, sinc...

Embodiment approach 3

[0119] For Embodiment 3 of the present invention, if according to Figure 5 The description is as follows. In addition, for convenience of description, the same reference numerals are assigned to the constituent elements having the same functions as those described in Embodiment 1 above, and description thereof will be omitted.

[0120] In this embodiment, an operation example when disturbance noise fluctuates in an AC manner in a short time range in the photodetection device 101 described above will be described. In particular, in the present embodiment, a case is assumed in which disturbance light is injected as AC single shot in a short time range. However, there may be cases where the potential of the power line fluctuates due to single-shot electrical noise such as ESD application, and AC noise is applied to the light-receiving amplified output (C) in a short period of time. same situation.

[0121] Figure 5 It is a waveform diagram showing an operation waveform of t...

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Abstract

The optical detection device of the present invention distinguishes disturbance noises, and outputs appropriate and correct detection results according to the state of each disturbance noise. The signal processing circuit (11) in the photodetection device (101) has an asynchronous detection part (112, 113), so that during the asynchronous detection period other than the synchronous detection period in the detection period, the value determined as the light receiving signal At least one of when the value of the received light signal is greater than the predetermined first threshold and when it is determined that the value of the received light signal is smaller than the predetermined second threshold is detected that the light received signal is not synchronized with the light emission drive timing. In addition, the signal processing circuit (11) holds the detection result of the presence or absence of the light-receiving signal by the synchronous detection part when the presence of the light-receiving signal asynchronous with the light-emitting drive timing is detected by the asynchronous detection part (112, 113). during the next testing period.

Description

technical field [0001] The present invention relates to a photodetection device and electronic equipment equipped with the same. Background technique [0002] Electronic devices such as handheld phones, smartphones, tablet information terminals, and digital cameras have display screens such as liquid crystal displays. In the electronic equipment as described above, various controls are performed in such a manner as to detect the degree of approach of the human body to the machine main body. In addition, the display screens of these electronic devices also serve as the information input function of the touch panel. [0003] Therefore, it is necessary to turn off the function of the touch panel when the user starts a call or puts the electronic device in a pocket, so that the electronic device will not be misled even if any object approaches the touch panel. Take action. Also, in digital cameras, control is performed such that the brightness of the display screen is automat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V8/12H01L31/12G01S7/4865G01S17/10
CPCG01V8/12G01S17/10G01S7/4865
Inventor 白坂康之平松卓磨
Owner SHARP KK