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Ambient light sensing method and sensing device thereof

The technology of a sensing method and sensing device is applied in the direction of using electric radiation detectors for photometry, etc., which can solve the problems of reducing resolution and reducing the data conversion speed of light sensors, etc.

Active Publication Date: 2016-08-17
LITE ON SINGAPORE PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former implementation reduces resolution
The latter implementation will increase the data conversion time of the analog / digital converter in a proportional manner while increasing the resolution, which will greatly reduce the data conversion speed of the light sensor.

Method used

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  • Ambient light sensing method and sensing device thereof
  • Ambient light sensing method and sensing device thereof
  • Ambient light sensing method and sensing device thereof

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Experimental program
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Embodiment Construction

[0027] [Example of Ambient Light Sensing Method and Sensing Device]

[0028] The sensitivity of the ambient light sensor can be adjusted. According to the ambient light entering the light sensor, it is estimated whether the measured current exceeds the preset linear sensing range of the light sensor, such as adjusting the sensitivity of the light sensor for the next sensing . Such an automatic gain algorithm can be built into the sensor chip or implemented at the controller level outside the sensor chip. According to the present invention, the dynamic range of the light sensor can be extended to 1000 times without sacrificing the resolution and data conversion speed of the light sensor.

[0029] The sensitivity of the light sensor can be adjusted to have multiple gain settings on the chip, or to expose the light sensor to multiple units of time frame (Time Frame) (or called frame), or to mix the above of two ways. Figure 2A It is disclosed that the ambient light sensing d...

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PUM

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Abstract

The invention discloses an ambient light sensing method and a sensing device thereof, comprising the following steps: firstly, obtaining a sensitivity setting and an exposure time, and obtaining a sensing signal of a light sensor according to the sensitivity setting and the exposure time. Then, when the sensing signal is available, it is judged whether the intensity of the sensing signal is within a preset range, wherein the preset range has an upper limit and a lower limit. Then, the sensitivity setting and exposure time of the light sensor are updated according to the judgment result of the intensity of the sensing signal. Next, the sensing signal of the light sensor is obtained according to the updated sensitivity setting and exposure time.

Description

technical field [0001] The present invention relates to a light sensor, and in particular to an ambient light sensing method and a sensing device thereof. Background technique [0002] The ambient light sensor (Ambient Light Sensor, ALS) provides a light response similar to that of the human eye. Display brightness management can extend mobile battery life and provide the best visual viewing experience whether the display is used indoors or outdoors. [0003] In mobile phone applications, tinted glass or black glass is often used to enhance the appearance of the mobile phone. However, black glass presents a special challenge for ambient light sensors because when ambient light passes through the black glass and strikes the light sensor, the spectrum of the ambient light is altered (or distorted) by the black glass. The typical transmittance of black glass is as figure 1 shown. Black glass has a high transmittance to the spectrum of infrared light (IR light). Unlike the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42
Inventor 蔡圣义温黛丽陈重志
Owner LITE ON SINGAPORE PTE LTD