240 watts of LED backlight for a 23″ computer monitor!

[This is a very old article from scanning backlight experiments in 2012]

A 23″ LCD computer monitor is 286mm high x 508mm wide. From math calculations on LED ribbons (120 LED per meter, 6mm wide, 6500K, ~10watt/meter, 80+CRI available), one can put 48 rows of 6mm-width ribbon segments behind a 23″ LCD. That’s a whopping 240 watts of backlight for a 23″ computer monitor!  

This will allow 90% motion blur reduction using ultra-short scanning backlight strobes (see FAQ) without a dim picture, 1.6ms strobes at 60Hz, resulting in 24 watt average actual power consumption. Many new 23″ LCD monitors with a LED backlight, adjusted to a comfortable brightness, consume just about 15-20 watts for the backlight itself. I will have brightness left over to go to 95% motion blur reduction, using 0.8ms strobes at 60Hz native refresh (simulating equivalence to 960Hz), or 0.4ms strobes at 120Hz native refresh (simulating equivalence to 1920Hz).

LED ribbons are cheap (search eBay, Alibaba, Google for “LED ribbon”). If you know another inexpensive alternatives of putting nearly 300 watt of backlight behind a 23″ monitor, contact mark[at]scanningbacklight.com


About Chief Blur Buster

Mark Rejhon, the founder of Blur Busters.

4 Comments For “240 watts of LED backlight for a 23″ computer monitor!”

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MrInvisible3
Member
MrInvisible3
The correct grid or checkerboard layout of LED’s will be important for easiest backlight diffusion. #5050 LED ribbons at 60 LEDs/meter have a 16mm LED pitch. The ribbons are 10mm wide, placed edge-to-edge as tightly as possible behind an LCD panel. Putting #5050 LED’s in a checkerboard pattern (offsetting every other row of ribbon horizontally by 8mm) will produce much more even backlight diffusion than aligning in a grid pattern due to the bigger difference in horizontal versus vertical pitch (16mm horizontal pitch, 10mm vertical pitch) in the grid layout. I am avoiding the waterproof ribbons. The transparent plastic casing… Read more »
MrInvisible3
Member
MrInvisible3
I have done some more research, and consultations with LED ribbon suppliers. I have come to the conclusion that #5050 LED’s may be a better bet. The ribbons with #5050 LED’s are much brighter, but the ribbons are wider at 10mm and there are only 60 LED’s per meter. However, the better inexpensive ribbons use 14.4 watts per meter, using high-efficiency white 6000K 70 CRI Epistar LED’s (21-22 lumens per LED, for high quality $7/meter ribbon). This is adequate color quality for a backlight, if the goal is motion blur elimination more so than photo image quality. For this #5050… Read more »
MrInvisible3
Member
MrInvisible3
The math is as follows: Typical sizes of computer monitors: 23″ computer display = 11.25″ x 20.00″ = 286mm high x 508mm wide. 27″ computer display = 13.24″ x 23.54″ = 337mm high x 598mm wide. For 8 millimeter wide ribbons ….. 36 ribbon pieces edge-to-edge behind a 23″ display (286mm divided by 8mm) ….. 43 ribbon pieces edge-to-edge behind a 27″ display (337mm divided by 8mm) Total ribbon wattage is 180watt for 23″, or 258watt for 27″ For 6 millimeter wide ribbons ….. 48 ribbon pieces edge-to-edge behind a 23″ display (286mm divided by 6mm) ….. 56 ribbon pieces… Read more »
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