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Photodetection device and electronic device

A technology of light detection device and detection part, which is applied in the direction of measuring device, optical device exploration, circuit, etc., and can solve the problem of the brightness reduction of the display screen and so on

Active Publication Date: 2017-12-01
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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  • Photodetection device and electronic device
  • Photodetection device and electronic device
  • Photodetection device and electronic device

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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PUM

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Abstract

The present invention distinguishes disturbance noises and outputs an appropriate detection result in accordance with the state of the respective disturbance noise. A signal processing circuit (11) in a photodetection device (101) has asynchronous detection units (112, 113) in the signal processing circuit (11) that detect the presence of a light reception signal that is asynchronous with a light-emission drive timing when at least either the value of a light reception signal is determined to be greater than a predetermined first threshold or the value of a light reception signal is determined to be less than a second threshold during an asynchronous period other than a synchronous period within a detection period. When the presence of a light reception signal that is asynchronous with the light-emission drive timing is detected by the asynchronous detection units (112, 113), the signal processing circuit (11) maintains the detection result of the presence of a light reception signal by a synchronous detection unit in the next detection 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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IPC IPC(8): G01V8/12H01L31/12G01S7/4865G01S17/10
CPCG01V8/12G01S17/10G01S7/4865
Inventor 白坂康之平松卓磨
Owner SHARP KK