LCD projectors are designed to display high-quality video from a variety of sources onto a screen at some given distance from the projector. Due to this variable distance, a few factors can cause the picture to suffer if certain display elements are not properly aligned and converged.
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The optical light engine in an LCD projector utilises three separate LCD panels responsible for the blue, red and green portions of the picture, respectively. Light is reflected and passed through a series of special mirrors which divides the light into the three primary colours, and is recombined by a prism after passing through the panels. When one or more of these panels burns out or malfunctions, it can affect the colour of the video displayed on the screen.
Different issues can be the source of the LCD panels not providing accurate colour convergence. Over a long period of usage, the heat generated by the lamp can cause one or more of the panels to become warped, or the panels may simply exceed their intended lifespan. Also, sudden jostling motions may cause the panels, or any other parts within the light engine, to be dislodged from their proper position.
Another issue that may appear to be a convergence problem is when the projector is displaying video through its RGB input and the picture is over-saturated with a blue or red tint. This can be the result of improper white balancing, and unlike a faulty LCD panel, this issue can be corrected by accessing and adjusting the projector's white balance setting.
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