UNIFORM LIGHT SOURCE WITH INTENSITY CONTROL USING LEDS

Shubha Kulkarni, Ramamani V, K Rajaram, Manjunatha Babu P

Abstract: The main objective of this paper is to reduce the size and the power consumption of the backlight unit. This was realized by intensity control of LEDs, as dimming of LEDs saves power. The information display devices play a major role in the transition to information oriented societies. The global move toward information societies is causing a sharp increase in the demand for information display devices. The rapid development of light emitting diodes (LEDs) over the past few years has surpassed the characteristics of incandescent lamps in luminous efficiency, durability, reliability, safety and power requirements. Though modern high power LEDs which produces up to 120 lm per device, several individual LEDs must be mounted on panels to obtain practical power. Nevertheless, in many lighting application a uniform illumination distribution is desired, which is affected by both the packing density and the array configuration of LEDs.

Keywords: LCD, LED, CRT, TLC

DOI: https://doi.org/10.15623/ijret.2015.0426016