Ambient Light Sensor | LED Lighting Technology | Opto Electronic Sensor

Ambient light sensor:

Ambient light sensors automatically adjust the backlighting of the instrument panel and various other displays in the vehicle according to the varying available or ambient-light conditions. It also served in electronic equipment’s like Laptop’s, cell phones and LCD TV’s to bring natural lighting solutions.

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Cabin backlight control:

For cabin backlight control LED lighting’s are used. A LED lighting technology significantly improves in cabin lighting systems. LEDS are indeed useful for spot beam applications, where light can be focused directly where it is needed, in a range of color’s and without disturbance to other passengers, in a word – control. But this is only the beginning, and LEDs are quite capable of providing much, much more.

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LEDS can provide colour wash to surfaces, creating sophisticated ambient and indirect lighting effects. It can do this by employing a range of colour LEDs singly or in combination or by employing tunable colour LEDs. This can be done with great precision, providing sophisticated control over colour, tone and brightness to generate an infinite variety of mood, brand or corporate effects.

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Features of LED:

  • Soft warm light – very comfortable on the eyes
  • Intensity – brighter than most halogens used
  • Very Low power consumption – Uses only 20% of the power of standard cabin light bulbs
  • Low glare – great for reading
  • No harmful UV emissions – easy on the eyes
  • Built in dimmer logic works with most standard dimmers or our optional mini-dimmer

Ambient light sensor in LCD TV’s, Laptops and Cell Phones:

It is a sensor that detects light so if it’s dark your screen monitor brightness will dim down. So you’re not looking at one source of extreme bright light, when its bright the screen monitor will go up to compensate for the extra light around you, so you can still see the monitor comfortably.

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Dark Room

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Dimly Light Room

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In addition to providing a pleasant-looking display, ambient light sensors also help reduce power dissipation and maximize the life of the backlighting system.

Ambient light sensors are included in many laptops and cell phones to sense the environment lighting conditions, allowing for adjustment of the screen’s backlight to comfortable levels for the viewer. The range of "comfortable levels" is dependent on the room’s light.01-ambient light sensor-for laptop-innovative energy saving sensor-adjusted to surrounding lighting conditions

Understandably, a screen’s brightness needs to increase as the ambient light increases. What is less obvious is the need to decrease the brightness in lower light conditions-for comfortable viewing and to save battery life. In a cell phone, the ambient light sensors are located under a protective cover glass. Because of this protection, most of the ambient light is obstructed. The obstruction reduces the amount of light to be measured, requiring a solution with low light accuracy. For the accuracy needed in low-light conditions, the best sensor choice is the integrated photodiode with an ADC.

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Optoelectronic Materials | Semiconductor Materials | Semiconductor Devices

Components of Opto-Electronics:

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Semi conductor materials:

Elemental semiconductors-Silicon, Germanium

Binary semiconductors-Aluminium, gallium, indium, phosphorus, arsenic, antimony

Ternary semiconductors-Aluminum, Gallium, Arsenic

Quaternary Semiconductors-Indium, Gallium, Phosphorous, Arsenic

Why Opto-electronics sensor system used:

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  • The sensors used in an automotive environment must be reliable
  • Produce exactingly accurate results
  • Require little maintenance
  • Help reduce overall system cost and extend the life of the system or sub system unit
  • Integrated optoelectronic sensors are non-contact sensors, that is, they are able to perform their sensing or measurement functions without the need for physical contact with other parts of the system or sub-system

Advantages:

  • Reducing the number of required components
  • Improving the reliability of the system or sub-system
  • Improving the styling, aesthetics and ergonomics of the overall vehicle through better utilization of the available space
  • Improving the manufacturability of the vehicle by reducing the number of sensors that need to be positioned during production

Disadvantages:

  • They are not giving any direct feedback