3. In an ideal system, a high brightness LED dissipates 1.2 Watts when a 100% du

Question

3. In an ideal system, a high brightness LED dissipates 1.2 Watts when a 100% duty cycle PWM signal drives the LED. How much power does the LED dissipate when driven with a PWM signal at a duty cycle of 35%? (5 Points) Power Dissipation at 35% Dutv Cvcle: 4. Many display controllers (whether for LED or LCD displays) multiplex display segments, turning groups of display segments on and off quicker than the human eye can perceive. Describe one benefit and one drawback of multiplexing display segments.

Explanation / Answer

Answer:-3) Power and duty cycle has a relation as-
P1 / P2 = (D1 / D2)2 , We have D1 = 1, D2 = 0.35, P1 = 1.2 W thus keeping aal these values we get,

P2 = 0.147 W or 147 mW

Answer:-4) One advantage of multiplexed display is the power consumption gets reduced, because the display is not ON all the time. Due to fast ON/OFF and persistance of vision this helps to reduce power consumption.

One disadvantage is that we may find flickering in display if duty cycle is not adjusted in proper way..

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