The Active-Matrix LCD is generally the most preferred. Each pixel (or cell) is controlled by a transistor, which is used to control the display.
Powering each transistor takes power. This display type uses a grid of wires with diodes over it. When current hits the diode at points on the grid, you see a display, again much as pixels are found on a traditional monitor.
This display type is expensive, because to achieve the wonderful color and clarity of image; transistors must be used to turn the diodes on or off. This is a display type considered easy on the eyes as the refresh rate is controlled actively.
The diodes are actually liquid crystal. Have you ever touched an active matrix flat panel display screen? No?
Well if you do the screen appears to float like liquid at the point of contact, what you are really doing is disturbing the current to the crystal.
One or more transistors, allowing refined control over the resulting display, control the current that is applied to the crystal diodes.
This presents the sharper, brighter and clearer colors associated with this display type and the resulting additional expense.
Watch for small spots on the screen where there is either a defective crystal (diode,) or if the whole screen is black then it is likely the transistors are gone.
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