Roof Mount LCD

[vskid]

We have a roof mount LCD (still need to install it, got a new vehicle), the board is behind the screen. The roof part is just a plastic plate that holds the screen to the roof, at least ours.

Almost all electronics use DC for their internal processes, its just that wall power is AC so they have adapters to make it DC. To my knowledge, the only part in an LCD that uses AC is the backlight if its a CCFL.

[APHawkes]

To be precise you'd need the LCD in your hands. You can approximate based on the diagonal size and the aspect ratio. "Regular" is 4:3 and "widescreen" is either 16:9 or 16:10. It's Pythagorean Theorem time to get the height and width. Note that this is the screen size, not the size including the bezel or frame.

The easiest numbers are for a 15" standard display. The ratio is 4:3. so if we have a triangle with one side for the height (a), one side for the width (b), and the diagonal (c).

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c^2 = a^2 + b^2
c = (a^2 + b^2)^(1/2)
c = (3*3 + 4*4)^(1/2)
c = (9 + 16)^(1/2)
c = (25)^(1/2)
c = 5

So, a regular tv of height 3 and width 4 would have a diagonal of 5. If we have a 15" screen we work it as this:

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x * 5 = 15"
x = 3"

so, our factor x is how much larger our actual display is from the theoretical 5 (unit) diagonal display. That means:

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height = x * a = 3" * 3 = 9"
width = x * b = 3" * 4 = 12"

Therefore, a standard 15" lcd has a screen approximately 9" tall by 12" wide. Change the numbers as needed for the screen and aspect ratio.