How much electricity does the matrix take from a 15.6-inch laptop?

Hello everyone :P

I wanted to know how much power is consumed by the matrix in a 15.6-inch laptop with the backlight turned on?
I measured with a wattmeter and, for example, a laptop swallows a total of about 13 W while viewing the desktop with the battery fully charged.

If you have a wattmeter, start the laptop and turn off the matrix, you should have a function button on the keyboard.
Click and insert a photo of the keyboard, I will write you which shortcut, or find the same keyboard on the Allegro and send a link.

On this keyboard, you have the matrix blank with the Fn + F7 shortcut (it then extinguishes the matrix without turning off the laptop)

Welcome. You can check carefully in the catalog note of your matrix. For example, when checking the LTN154AT07 matrix with a single fluorescent lamp, the operating voltage of the lamp (type 705V) and current (min 3.0mA, type 6.0mA, max 6.5mA) are listed in the backlight parameters. 6-6.5mAmA it will be the brightest screen so it will be 4230mW (typ), 4583mW (max). In fact, the efficiency of the inverter should also be taken into account. If we assume that it is 80%, we have something in the vicinity of 5.2-5.7W (in theory, but in my opinion such a value makes sense). Other matrices with one CCFL lamp should have similar values.

Thank you very much ! , it follows that the laptop matrix outclasses all other external monitors in terms of savings.

atomic99 wrote:

If you have a wattmeter, start the laptop and turn off the matrix, you should have a function button on the keyboard.

I know, I know, but it only turns off the backlight, not the matrices Sooner you could set the power options (after closing the lid, set - do nothing) then close the lid and look at the wattmeter.

Krzysiek27 wrote:

shows that the laptop matrix outclasses all other external monitors in terms of savings.

How much will you save per month? 1-2 PLN

And there will always be beer for heh.

Noo. All beer But it's not for a month.

Let's compare, based on two monitors, how much you save and what you lose.
Iiyama ProLite E1780SD-B1, 17 ", 1000: 1 contrast, 250cd / m2 brightness, 5ms response time, 14W power consumption
Iiyama ProLite E2278HD-GB1, 21.5 ", 1000: 1 contrast, 300cd / m2 brightness, 5ms response time, 20W power consumption

As for the matrix, it is worth mentioning that in this laptop, not only the backlight consumes electricity, but also the matrix itself, it is 400-500mA with 3.3V, i.e. 1.3-1.6W. Whatever controls this matrix also draws current. How much? I have no idea. 1-2W? We already have 5.5W backlight, 1.5W matrix electronics, let's assume 2W for a DSUB or DVI to LVDS converter. The whole thing should draw 9W.

So we have a "monitor" 15.4 "with a contrast of 300: 1 in gusts up to 500: 1, with a brightness of about 200cd / m2 in good winds and a response time of about 16ms consuming 9W.

Compared to a 17 "monitor, we have a 5W difference, compared to a 21.5" 11W monitor,
At 8 hours a day, you will lose:
17 ": 5W * 8h * 360days = 14.4kWh, which, with the cost of electricity, let's assume 60 groszy / kWh, will give PLN 8.6 (per year).
21.5 ": 11W * 8h * 360days = 31.7kWh, that's PLN 19 per year.

With a 21.5 "monitor running 8 hours a day, you will be saving for one low-end beer for two months looking at a lower quality image.

Economics can never be too much.
Taking the first one from the shore Iiyama ProLite E1780SD-B1, 17 "1000: 1, an hour and in sight , you can already buy it for PLN 560 (-100 cost of my monitor) = 460 / 2.5 (beer) = how many beers can you buy for it? 184. :D


Do not close this topic, I will add a post here with information about how much this 15.4 inch monitor is taking me, measured with a wattmeter with a bonus (power factor.)

Krzysiek27 wrote:

Taking the first one from the shore Iiyama ProLite E1780SD-B1, 17 "1000: 1, an hour and in sight

This is an example of a 17 "LED backlit monitor. Choose another one that works better for your eyes. If it has flicker free technology it will not draw any more electricity. These monitors are used as examples in their classrooms.

Krzysiek27 wrote:

you can already buy it for PLN 560 (-100 the cost of my monitor) = 460 / 2.5 (beer) = how many beers can you buy for it? 184.

Why buy a computer at all, you can count on fingers, calculators, abacus or sheets of paper. So many more beers!

atomic99 wrote:

If you have a wattmeter, start the laptop and turn off the matrix, you should have a function button on the keyboard.
Click and insert a photo of the keyboard, I will write you which shortcut, or find the same keyboard on the Allegro and send a link. On this keyboard, you have the matrix blank with the Fn + F7 shortcut (it then extinguishes the matrix without turning off the laptop)

Buddy, you gave me a brilliant idea. And if I connected to another monitor using the F8 key, it automatically turns off the entire matrix electronics. E.t.c.

I took measurements with a wattmeter.

Laptop on, desktop viewing (brightness 1/10) 12.9 W
Laptop on, off matrix + off backlight 10.75 W
Laptop on, viewing the desktop on TV via 11.3 W VGA cable
The power factor oscillates between 0.44-0.45% (PF)
12.9 - 10.75 = 2.15 W. Matrix power consumption + backlight, is it possible? Unlikely. Because it is impossible to turn off the electronics that controls the matrices. You can safely add 4-5W. So it will come out 6-7 W. As my colleagues wrote.

Lenovo y550 laptop specification.
Matrix - 15.6 inch 1366-768
Processor - Intel Pentium 4400 2 x 2.2 GHz
Memory - 4 GB DDR 3 Dual channel samsung
Graphics - nvidia 210 m 512 MB

2-3W is very real.
I have a 62Wh battery in my laptop
The battery lasts 8 hours, which is 7.75W / h
So if the matrix draws 2W. The remaining 5.25W is consumed by the processor RAM disk board, etc. So in my laptop it can take up to 3W.