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©1996, 1997 - INLINE, INC. IN2160 OPERATION MANUAL - VERSION 1.1 09/05/00
SPECIAL APPLICATION: LCD DISPLAY DEVICES
When using an Interface with an LCD panel or projector, some special considerations must be made.
Many LCD display devices utilize a “look-up table” when identifying an input signal. The display device
compares the parameters of the input signal to those in its table and looks for a match. If there is no
match to the signal format it is receiving, it may not be able to display the image properly. Some
parameters that the LCD devices use to recognize a signal are sync format, polarity, and horizontal and
vertical scan rates.
An Interface is often used to change the sync format. However, in doing this, you might make the signal
unrecognizable to the LCD device. For example, let’s look at a 640 x 480 VGA signal:
The user is utilizing the IN2160 interface to convert a VGA signal to an RGBS output. The LCD
projector is expecting to see VGA as RGBHV at 31.5 KHz. Because the interface changes the signal
format to RGBS, the LCD projector does not recognize the signal as VGA at 640 x 480 resolution. The
resulting image may be the wrong size, scrambled, or nothing at all.
The solution is to set the IN2160 for an RGBHV output so that the LCD projector can recognize it as
VGA. In addition, you may need to set the dip switches to mirror the input sync polarities and/or disable
the Horizontal position control.
