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Edge lit LEDs don't have PWM?

post #1 of 3
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Edge lit LEDs don't have PWM?

I have a edge lit LED as well is a backlit. When I down the brightness on both of these TVs and do the finger wagging test in front of the TV I noticed the strobe effect on the backlight TV but not the edge lit TV. Since as led TVs use a diffusion screen I'm wondering if this actually prevents PWM because all the light is constantly bouncing around everywhere?
post #2 of 3
Quote:
Originally Posted by ovawe View Post

Edge lit LEDs don't have PWM?

I have a edge lit LED as well is a backlit. When I down the brightness on both of these TVs and do the finger wagging test in front of the TV I noticed the strobe effect on the backlight TV but not the edge lit TV. Since as led TVs use a diffusion screen I'm wondering if this actually prevents PWM because all the light is constantly bouncing around everywhere?
No, edgelit displays can have PWM. PWM existence is independent of whether or not the display uses a backlight or edgelight.
post #3 of 3
If the LEDs used are sufficiently good at high frequencies, they can use PWM and you won't even notice. My IPS235V when calibrated is totally unnoticeable, and I can tell you that it DOES use PWM to dim the backlight.

My limit is around a KHz. Even at very low duty cycles (25%) I can only see a very faint flicker if I very rapidly move an object in front of the screen. Else, I don't even see it.
   
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AGP bencher
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PowerCaseMouseAudio
SF Leadex II 650W Lian Li PC-A05NB Logitech G9 Xonar DX 
AudioAudio
SMSL SA-S3+Technics CB-250 Sennheiser HD555 
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AMD A10-5700 Gigabyte F2A75M-HD2 G.SKILL Ares 2133 CL9 Hitachi 5K750 
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