The ambient light sensor is mainly composed of optical components. Photosensitive components have developed rapidly, many varieties, and widely used. The environmental light sensor can perceive the surrounding light situation and inform the processing chip to automatically adjust the backlight of the monitor to reduce the power consumption of the product. On the other hand, the ambient light sensor helps the display with a soft picture. When the brightness of the environment is high, the liquid crystal display using the ambient light sensor will automatically adjust to high brightness. When the external environment is dark, the display will be adjusted into a low brightness.
Light distance is close to the sensor chip -WH APS 4530A is a kind of light to digital converter. It combines advanced environmental light sensors, advanced sensors and high -efficiency infrared LED lights. A filter is built -in filter to suppress infrared, and provides a spectrum close to human eye reactions. ALS can work under dark to sunlight, and the selected detection range is about 40dB. Dual -channel output (human eye and clear), so that ALS has a good light ratio under different light conditions. A 940nm filter is built -in sensor (PS) for environmental light. Therefore, PS can detect reflex infrared light, which has high precision and excellent resistance. The WH4530A has a programmable interruption function, and has threshold -based lag for ALS and PS.
Environmental light sensors have small dark current, low -illumination response, high sensitivity, and linear changes with the light illuminance of the current; built -in dual -sensitive element, automatic attenuation near infrared, spectral response close to human eye function curve (black: human eye response curve curve , Blue: Optical resistance response curve, green: ambient light response curve); Another consideration of another consideration when choosing an appropriate light sensor is to choose a sensor with an ideal spectrum response. Ordinary PIN Photosami diode or optical resistance (passive or active) itself has a very wide spectral response range, including IR rays and even UV rays.
Post time: Dec-08-2022