Churches can easily spend a lot of money on new video or computer technology. People unfamiliar with the use of multimedia or computers in the classroom may not be supportive of the church expending funds on such items. PC to TV converters are a cost effective way to demonstrate the use of the new technology to those who are unfamiliar or skeptical of the practical uses of computers in the Bible class. A few years ago there weren't very many to chose from but today there is such a wide range of selection that the choice can be difficult. Older technology units typically require software to make the converters fully compatible with Windows type software.
Some companies even package presentation software and wireless remote controls with their products.
Genlock is a feature that allows the converter to be used in effectively mixing regular video images from a video camera with the computer and is usually used by those making title screens and text overlays for motion video. If you look closely at your TV screen and computer monitor you will notice that they are not the same shape. The computer screen is a lot wider than it is tall. The computer image doesn't exactly fit on the TV screen. The class only sees the last image frozen.