Almost all camera phones can be used as digital cameras. Users certainly want to take high-quality photos in low light conditions. Therefore, it is necessary to add an illumination source to the camera phone and not quickly exhaust the needs of the phone battery. Start to appear. White LEDs are widely used as camera flashes in camera phones. There are now two digital camera flashes to choose from: Xenon flash tubes and white LEDs. Xenon flash lamps are widely used in film cameras and stand-alone digital cameras due to their high brightness and white light. Most camera phones have chosen white LED lighting. 2. LED flash has lower power consumption
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The LED flash used in the Nokia N75 phone is on the right side of the camera lens above the phone.
1. LED strobe speed is faster than any light source
LEDs are current-driven devices whose light output is determined by the forward current that passes through. LEDs have a faster strobe speed than any other source, including xenon flash lamps, which have a very short rise time ranging from 10 ns to 100 ns. The quality of white LEDs is now comparable to that of cool white fluorescent lamps, with a color performance index close to 85.
LED flash lamps have lower power consumption than xenon flash lamps. In flash applications, the LED can be driven with a pulsed current with a small duty cycle. This results in a significant increase in the current and current produced by the light during the actual pulse while still maintaining the average current level and power consumption of the LED within its safety rating.
3. The LED driver circuit takes up a small space and the electromagnetic interference (EMI) is small.
4. LED flash can be used as a continuous light source
Due to the nature of the LED lights, LEDs can be used for image applications and flashlight functions in mobile phones.
Finally, let's talk about some requirements for camera phone flash selection LEDs: although there are no packaging and electronic standards in the flash LED field, manufacturers have defined many LED components for camera flash applications. Therefore, when designing an LED flash in a camera phone, the following guidelines need to be considered:
Optical properties
2. Thermal considerations
3. Pulse modulation function
4. Electronic design simplicity and flexibility
5. Can be effectively cascaded for higher light output
6. Manufacturing and assembly considerations. Especially the compatibility of LED modules with the manufacturing process used by camera phones