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Power Consomption of LCD Backlight

Topic started by Andrew Murr on 23 May 2009

6 Posts

23 May 2009, 04:45 pm

Is it true that when on Full beam, the backlight on a LCD HD TV, uses alot ot power, thus producing very big electricity bills?

As you will or will not know, I have a Toshiba 32C3030DB Regza C-Model. When I turn my Back light lover, the picture becomes dark. turn up the brightne4ss, and the picture is somewhat whitewashed.

I am still in a state of confusuion about automatic backlight control.

Please Help.

Andrew Murr

Sheffield UK

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28 May 2009, 09:34 am

Hello Andrew.

You're correct. If the backlight is at its maximum brightness, then it will use a lot of power and the picture will appear washed out, and blacks will look grey.

Set it to the minimum, and power consumption will drop, and the picture will get a lot darker. This is a good setting for viewing movies at night, but not so good for watching Neighbours at lunchtime.

What the automatic control does, is look at the light in the room, and adjust the backlight to make it appropriate for the conditions. It's actually a pretty good way of doing things, and can work very well.

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28 May 2009, 03:33 pm

So in other words, the Active Backlight control is like a room light sensor, that measuresthe light in the room, in my case my bedroom. However on one of the shelves by my bed, is a desk lamp.

On the very top shelf of the shelving unit, I have a ball shaped lamp shade with a bulb inside on a Chrome silver 3 legged ring stand , which shines not as light as the desk lamp. When I watch a film, or something recorded on Sky +,
I turn the desk lamp off, and use the light ball, Would you recomend that or get a lamp with a proper shade on it?

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28 May 2009, 08:42 pm

Andrew Murr says:
So in other words, the Active Backlight control is like a room light sensor, that measuresthe light in the room, in my case my bedroom. However on one of the shelves by my bed, is a desk lamp.

On the very top shelf of the shelving unit, I have a ball shaped lamp shade with a bulb inside on a Chrome silver 3 legged ring stand , which shines not as light as the desk lamp. When I watch a film, or something recorded on Sky +,
I turn the desk lamp off, and use the light ball, Would you recomend that or get a lamp with a proper shade on it?

I have no idea what you mean

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29 May 2009, 12:54 pm

Andrew Murr says:
So in other words, the Active Backlight control is like a room light sensor, that measuresthe light in the room, in my case my bedroom. However on one of the shelves by my bed, is a desk lamp.

On the very top shelf of the shelving unit, I have a ball shaped lamp shade with a bulb inside on a Chrome silver 3 legged ring stand , which shines not as light as the desk lamp. When I watch a film, or something recorded on Sky +,
I turn the desk lamp off, and use the light ball, Would you recomend that or get a lamp with a proper shade on it?


The TV should be able to cope with most sorts of ambient light.

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30 May 2009, 10:28 am

With just the ball lamp on, I brought the back light down to level 50, later down to 40, and now it is at 30. Though I haven't saved that customised setting in to picture presets mem. Viewing the Terrestial channel this morning, blinds closed, the picture was dark, should I boost the brightness, or enable Active backlight control?

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