Polarizing layers in monitors

[Zethlon]

Hello

i am doing an assignment on monitors, and was doing a rundown of the layers in a regular LCD panel. but i am not sure what the polarizing layers are for on each side of the liquid crystal layer.

it would be cool if someone could just give a simple, or advanced explanation of what they are for.

thanks in advance

[Glenwing]

1 hour ago, Zethlon said:

Hello

i am doing an assignment on monitors, and was doing a rundown of the layers in a regular LCD panel. but i am not sure what the polarizing layers are for on each side of the liquid crystal layer.

it would be cool if someone could just give a simple, or advanced explanation of what they are for.

thanks in advance

The polarizing filters are what allow the LCD to control whether light passes through each pixel or is blocked. The light generated by the backlight unit is unpolarized. The first polarizing filter is before the LCD panel, and polarizes all the light waves into one orientation before they pass through the panel. The second polarizing filter is after the LCD panel, and is at 90° orientation from the first one, so it will block all light unless the light is changed by the LCD panel to match the second filter. The liquid crystals in the LCD panel can change the orientation of the light, depending on the orientation of the crystal. The crystals are controlled by applying voltage to the crystals, the voltage is distributed via the LCD panel's TFT backplane (a grid of wires and transistors). If you want light to pass through a certain pixel, you can deliver voltage to that pixel, which will rotate all the crystals so that they re-orient the light so that it can pass through the second filter.

[Zethlon]

18 hours ago, Glenwing said:

The polarizing filters are what allow the LCD to control whether light passes through each pixel or is blocked. The light generated by the backlight unit is unpolarized. The first polarizing filter is before the LCD panel, and polarizes all the light waves into one orientation before they pass through the panel. The second polarizing filter is after the LCD panel, and is at 90° orientation from the first one, so it will block all light unless the light is changed by the LCD panel to match the second filter. The liquid crystals in the LCD panel can change the orientation of the light, depending on the orientation of the crystal. The crystals are controlled by applying voltage to the crystals, the voltage is distributed via the LCD panel's TFT backplane (a grid of wires and transistors). If you want light to pass through a certain pixel, you can deliver voltage to that pixel, which will rotate all the crystals so that they re-orient the light so that it can pass through the second filter.

Thank you, that was very helpful